Question

A train of length 150 m takes 10 seconds to pass over another train 100 m long coming from the opposite direction. If the speed of the first train be 30 kmph, the speed of the second train is

• A. 36 kmph
• B. 54 kmph
• C. 60 kmph
• D. 72 kmph

Answer 1

The correct option is C 60 kmph

$\text{Let the speed of second train be}x\text{kmph.}\text{Relative speed}=(30+x)kmph=(30+x)\times \frac{5}{18}m/sec(150+100)\times \frac{18}{5(30+x)}=10\Rightarrow x=60$