A bus is moving at a speed of 30 km/hr ahead of a car with speed of 50 km/hr. How many kilometres apart are they if it takes 15 minutes for the car to catch up the bus?
(a) 5 km (b) 7.5 km (c) 12.5 km (d) 15 km
(a) According to question relative speed of the car with respect to the bus
= 50 – 30 = 20 km/hr.
Now, Distance between the car and the bus,
when the car catches the bus = Distance travelled by the car in 15 min
