Question

Two cars are moving at 30kmph in the same direction with a seperation of 5km.if a<br />truck moving in opposite direction crosses the two cars in an interval of 4 min<br />The speed of the truck is -<br />A) 30kmph B 45kmph C) 60kmph D) 75kmph​

Answer 1

Answer:

b) 45 km / ph

Explanation:

Since the two cars are moving in the same direction with same speed therefore relative speed between two cars is zero.

Let the relative speed of the third car be w.r.t the two cars.

Relative velocity of the third car:  

(4/60)h

5km

​  

=75km/h

Actual velocity of the third car:75−30=45km/h