Question

Two cars are moving in the same direction with a
speed of 30 km/h. They are separated from each
other by 5 km. Third car moving in the opposite
direction meets the two cars after an interval of
4 minutes. The speed of the third car is
(1) 30 km/h
(2) 25 km/h
(3) 40 km/h
(4) 45 km/h​

Answer 1

Answer:

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

Answer 2

Explanation:

Two cars are moving in the same direction with a

speed of 30 km/h. They are separated from each

other by 5 km. Third car moving in the opposite

direction meets the two cars after an interval of

4 minutes. The speed of the third car is

30