Certificates / Quantitative aptitude / Time, Speed and Distance
Time, Speed and Distance: lesson, then the certificate test
Step 1: the lesson (about 1 min)
Distance = speed × time. Keep the units the same throughout.
- km/h to m/s: multiply by 5/18. m/s to km/h: multiply by 18/5.
- Two bodies moving the same way: subtract their speeds (relative speed). Opposite ways: add them.
- A train passing a pole covers its own length; passing a platform covers its length plus the platform's.
Worked example
A 150 m long train runs at 72 km/h. How long does it take to pass a pole?
- 72 × 5/18 = 20 m/s
- Distance = 150 m (its own length)
- 150 ÷ 20 = 7.5 seconds
Answer: 7.5 seconds
Watch out
- Mixing km/h with metres: convert first.
Made by Shishya (AI-assisted): a general method in our own words, with our own example; no exam or platform question is copied.
Step 2: the test
- 15 questions from Shishya's checked question bank, 20 minutes. Pass mark: 11 correct.
- Scored on Shishya's server; the answers are not shown afterwards, so the test stays fair. Each attempt draws new questions.
- Free. Your first test needs no account; sign up free to take more. Your answers and score are not stored; if you pass, you choose the name to print (ages 13 and up).
- It is a Shishya completion certificate — not a university or government credential. The test is not supervised.