Railways NTPC · Mathematics
Arithmetic: Time, Work and Speed
10 practice questions, each with the answer and an explanation.
Practise Arithmetic: Time, Work and Speed now
Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.
All 10 questions
- A boat's speed in still water is 12 km/h and the stream flows at 3 km/h. How long does it take to go 36 km downstream and return?
- A boat's speed in still water is 20 km/h and the stream flows at 4 km/h. How long does it take to go 24 km downstream and return?
- Two trains 150 m and 150 m long run on parallel tracks in opposite directions at 90 km/h and 54 km/h. How long do they take to cross each other?
- A train 150 m long runs at 72 km/h. How many seconds does it take to cross a pole?
- A train 120 m long runs at 72 km/h. How many seconds does it take to cross a pole?
- Pipe A fills a tank in 20 hours and pipe B in 30 hours. If both are opened together, how long do they take to fill the empty tank?
- A train 100 m long runs at 72 km/h. How many seconds does it take to cross a pole?
- A person covers 90 km at 45 km/h and returns the same 90 km at 30 km/h. What is the average speed for the whole journey?
- Two trains 180 m and 120 m long run on parallel tracks in opposite directions at 80 km/h and 40 km/h. How long do they take to cross each other?
- A can do a work in 30 days and B in 15 days. They work together for 2 days, then A leaves. In how many more days does B finish the remaining work?
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