Question

Two trains, each 50 m long are travelling in opposite direction with velocity 10 m/s and 15 m/s. The time of crossing is

• A. $2s$
• B. $4s$
• C. $2\sqrt{3}s$
• D. $t = \frac{\nu_{1} - \nu_{2}}{a}$

Answer 1

Answer: (B)

$4s$

Answer 2

Time$= \frac{\text{Total length }}{\text{Relative velocity }} = \frac{50 + 50}{10 + 15} = \frac{100}{25} = 4\mspace{6mu}\sec$