Question

Two cars are travelling in the same direction with a velocity of $60km/h$. They are separated by a distance of $5km$. A truck moving in opposite direction meets the two cars in a time interval of $3$ minutes. The velocity of the truck is : (in $km/h$)

• A. $20$
• B. $30$
• C. $40$
• D. $60$

Answer 1

The correct option is C $40$

Distance covered by truck $=5km$
Time $=3min$
Relative velocity of truck $=\frac{5km}{3min}$$=\frac{5km}{\frac{3}{60}hr}=\frac{300}{3}=100km/h$
Now, velocity of truck $=v=(100-60)$
$\Rightarrow v=40km/h$