Question

A car travelling at $60km/h$ overtakes another car travelling at $42km/h$. Assuming each car to be $5.0m$ long, the time taken for the over taking is

• A. $6s$
• B. $4s$
• C. $3s$
• D. $2s$

Answer 1

The correct option is D $2s$

Relative velocity $=60-42=18km/h$
$v=\frac{18\times 1000}{3600}=5m/s$

Distance to be covered $=5+5=10m=D$

Time taken $=\frac{D}{v}=\frac{10}{5}=2sec$