Skip to content
  • No data uploaded
  • Instant results
Competitive Exam Practice

SSC CPO Speed, Distance, Trains & Boats Questions

Practise speed, distance, trains & boats (quantitative aptitude) for the SSC Sub-Inspector in Delhi Police & CAPFs Examination: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.

Speed, Distance, Trains & Boats practice

0 / 10 answered Take a timed mock test

  1. Q1.A car goes from A to B at 60 km/h and returns at 20 km/h. What is its average speed for the round trip?

    Show answer & explanation

    Answer: B — 30 km/h

    For equal distances, average speed = 2xy/(x + y) = 2×60×20/80 = 30 km/h (not the simple average).

  2. Q2.A 110 m long train running at 90 km/h crosses a 160 m long platform. How long does it take?

    Show answer & explanation

    Answer: B — 10.8 seconds

    Speed = 90 × 5/18 = 25 m/s. Distance = train + platform = 110 + 160 = 270 m. Time = 270/25 = 10.8 s.

  3. Q3.A car goes from A to B at 50 km/h and returns at 60 km/h. What is its average speed for the round trip?

    Show answer & explanation

    Answer: B — 54.55 km/h

    For equal distances, average speed = 2xy/(x + y) = 2×50×60/110 = 54.55 km/h (not the simple average).

  4. Q4.A boat goes 22 km/h downstream and 14 km/h upstream. What is its speed in still water?

    Show answer & explanation

    Answer: C — 18 km/h

    Speed in still water = (downstream + upstream)/2 = (22 + 14)/2 = 18 km/h; stream = (22 − 14)/2 = 4 km/h.

  5. Q5.A 100 m long train running at 72 km/h crosses a 100 m long platform. How long does it take?

    Show answer & explanation

    Answer: D — 10 seconds

    Speed = 72 × 5/18 = 20 m/s. Distance = train + platform = 100 + 100 = 200 m. Time = 200/20 = 10 s.

  6. Q6.A 110 m long train running at 90 km/h crosses a 390 m long platform. How long does it take?

    Show answer & explanation

    Answer: B — 20 seconds

    Speed = 90 × 5/18 = 25 m/s. Distance = train + platform = 110 + 390 = 500 m. Time = 500/25 = 20 s.

  7. Q7.A boat goes 21 km/h downstream and 19 km/h upstream. What is its speed in still water?

    Show answer & explanation

    Answer: D — 20 km/h

    Speed in still water = (downstream + upstream)/2 = (21 + 19)/2 = 20 km/h; stream = (21 − 19)/2 = 1 km/h.

  8. Q8.A car goes from A to B at 30 km/h and returns at 20 km/h. What is its average speed for the round trip?

    Show answer & explanation

    Answer: D — 24 km/h

    For equal distances, average speed = 2xy/(x + y) = 2×30×20/50 = 24 km/h (not the simple average).

  9. Q9.A boat goes 18 km/h downstream and 10 km/h upstream. What is its speed in still water?

    Show answer & explanation

    Answer: A — 14 km/h

    Speed in still water = (downstream + upstream)/2 = (18 + 10)/2 = 14 km/h; stream = (18 − 10)/2 = 4 km/h.

  10. Q10.A car goes from A to B at 50 km/h and returns at 36 km/h. What is its average speed for the round trip?

    Show answer & explanation

    Answer: D — 41.86 km/h

    For equal distances, average speed = 2xy/(x + y) = 2×50×36/86 = 41.86 km/h (not the simple average).

Free SSC CPO Speed, Distance, Trains & Boats Questions by pGento

How to approach speed, distance, trains & boats questions

Convert km/h to m/s by × 5/18. Trains crossing a platform cover train + platform length. Downstream = boat + stream; upstream = boat − stream. Average speed for equal distances is the harmonic mean 2xy/(x + y).

About SSC CPO

SSC Sub-Inspector in Delhi Police & CAPFs Examination — conducted by Staff Selection Commission (SSC). Recruits Sub-Inspectors for Delhi Police and the Central Armed Police Forces.

Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.

SSC CPO practice topics

TopicSectionQuestion source
PercentagesQuantitative aptitudeCalculated (new numbers every set)
Speed, Distance, Trains & BoatsQuantitative aptitudeCalculated (new numbers every set)
Logical ReasoningReasoningCalculated (new numbers every set)
English GrammarEnglishQuestion bank
Vocabulary & IdiomsEnglishQuestion bank
Indian Polity, History & GeographyGeneral awarenessQuestion bank

Frequently asked questions

A car goes from A to B at 60 km/h and returns at 20 km/h. What is its average speed for the round trip?
Answer: B — 30 km/h. For equal distances, average speed = 2xy/(x + y) = 2×60×20/80 = 30 km/h (not the simple average).
A 110 m long train running at 90 km/h crosses a 160 m long platform. How long does it take?
Answer: B — 10.8 seconds. Speed = 90 × 5/18 = 25 m/s. Distance = train + platform = 110 + 160 = 270 m. Time = 270/25 = 10.8 s.
A car goes from A to B at 50 km/h and returns at 60 km/h. What is its average speed for the round trip?
Answer: B — 54.55 km/h. For equal distances, average speed = 2xy/(x + y) = 2×50×60/110 = 54.55 km/h (not the simple average).
Are these real past exam papers?
No. Every question is an original practice question written in the style, syllabus and difficulty of the exam, with a worked explanation. The site is not affiliated with any exam body.
SSC CPO Speed, Distance, Trains & Boats Questions

Embed this tool on your site

Paste this code into any web page. It stays free, fast and ad-free inside your site.

Print or save as PDF

Prints just this tool and its result. Choose “Save as PDF” as the printer to get a file. Branding is stored only in this browser.