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A train goes through a 1100 m long tunne...

A train goes through a `1100 m` long tunnel at a constant speed of `72 km//h`. The last compartment comes out one minute after the entry of engine in the tunnel. Find the length of train (including engine).

A

`80 m`

B

`100 m`

C

`1200m`

D

`1000m`

Text Solution

Verified by Experts

The correct Answer is:
B
`t=60 sec`
Total distance travelled `=1100+L`
Speed `=72 (km)//(hr)=20 m//sec`
`rArr60=(1100+L)/(20)rArr1200=1100+L`
`rArrL=100 m`
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