Question

a car is moving with constant speed of 60 km/hr on a straight road.looking at the rear view mirror,the driver finds that car following him is at distance of 100m and is approaching with a speed of 5km/hr.in order to keep track of the car in the rear,the driver begins to glance alternatively at the rear and side mirror of his car after after every 2s till the other car overtakes.if two cars are maintaining their speeds,then what are their respective speeds?

Answer 1

The car (say car A) has a speed of 60km/hr
The car behind (say car B) has a speed of 5km/hr according to rearview mirror.

So the speed of car B = speed of car A + speed of car B relative to car A
                                       = 60km/hr + 5km/hr
                                       = 65km/hr