Question:
A certain distance was covered by a car at a speed of 60 km per hour and comes back at the speed of 36 km per hour . What is the average speed of the car ?
A30 Km/hr
B40 Km/hr
C45 Km/hr
D48 Km/hr
Answer:
C. 45 Km/hr
Explanation:
average speed of the car = 2xy/(x + y) = 2 × 60 × 36/96 = 45 km/hr