Question

Two trains are running on parallel lines in the same direction at speeds of 40 kmph and 20 kmph respectively. The faster train crosses a man in the second train in 36 seconds. The length of the faster train is

• A. 200 metres
• B. 185 metres
• C. 225 metres
• D. 210 metres

Answer 1

The correct option is A 200 metres

$t=\text{time required}\frac{L_T+L_O}{S_T-S_O}{S}_T-S_O=40-20=20km/h=20\times \frac{5}{18}=\frac{50}{9}m/sNowt=\frac{L_T}{50/9}\Rightarrow 36=\frac{L_T}{50/9}So,L_T=200m$