Question

A train 300 m long is running at a speed of 90 km/hr. How many seconds will it take to cross a 200 m long train running in the opposite direction at a speed of 60 km/hr ?

• A. 7 51
• B. 60
• C. 12
• D. 20

Answer 1

Answer: (C)

12

Answer 2

Formula for time take = $\frac{Distance}{Speed}$
Sum of Length of Trains = 200 + 300 = 500
Time taken = $\frac{Distance(\ Sum\ of\ length \ of\ trains)}{Relative\ Speed}$
Relative speed = Addition of the two speeds, since trains travelling in opposite direction.
According to the formula
t = $\frac{500}{90+60}× \frac{5}{18}$
t = 12 seconds
The correct option is (C)