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Puzzle 2
A long train, half a kilometre long, is about to enter a long tunnel. The tunnel is 10km 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?
A long train, half a kilometre long, is about to enter a long tunnel. The tunnel is 10km 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?
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Almost. I think this forum may be brighter than I gave it credit for :(
I might be having a thick day but I get 18 minutes... - can you provide workings out with solution
I make the train 1 km long, and it takes 18 mins 51 seconds to travel 11km at 35kph.
front of the train has to travel 10k to leave the tunnel, and then a further 0.5k until the end of the train has left the tunnel. so a total of 10.5k. Which takes 60 x (10.5/35) = 18 minutes.
Surely the front entering to the end leaving makes 1km?
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