[X]    Privacy Policy

BrainBashers uses cookies and by using BrainBashers you agree to our use of cookies.

[X]    Common Answers

Have you entered July's Common Answers?

BB Logo Spacer

Puzzle - Answer

A long train, half a kilometre long, is about to enter a long tunnel.

The tunnel is 10k long. If the speed of the train is 35kph, how long will it take for the entire train to pass through the tunnel - from the front of the train entering to the end of the train leaving the tunnel?

 [Ref: ZRWF]

Answer: The train takes 18 minutes.

The front of the train has to initially travel 10k to leave the tunnel, and then a further 0.5k until the rear of the train has also left the tunnel - a total of 10.5k.

The train is travelling at 35kph and using Time = Distance ÷ Speed gives:

     Time = 10.5 ÷ 35 = 0.3 hours.

Convert this to minutes:

     0.3 x 60 = 18 minutes. QED.

Back to the puzzles...



This website uses cookies, for more information please view our privacy policy.