Last wagon

A 200 m long train passes through the 700 m long tunnel so that a time of 1 minute elapses from the entry of the locomotive into the tunnel to the exit of the last wagon from the tunnel. Find the speed of the train.

Correct answer:

v =  15 m/s

Step-by-step explanation:

a=700 m b=200 m t=1 min s=1 60  s=60 s  s=a+b=700+200=900 m  v=ts=60900=15 m/s

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