1.

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`

Answer» Correct Answer - 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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