Question

Two express trains of length 320 m and 380 m started moving from Ahmedabad to Delhi at the same time. Their speeds are 84 km/h and 42 km/h, respectively. In how many seconds will the faster train cross the slower train?

• A. 60 sec
• B. 120 sec
• C. 50 sec
• D. 45 sec

Answer 1

Answer:

A. 60 sec

$relative speed =84-42=42kmph$

$42\times \frac{5}{18}=\frac{70}{6}m/s$

length=320+380=700m

time = $\frac{700}{\frac{70}{6}}= 60$