Question

A car moving at a constant speed of 60 km per hour from one km and 40 km per hour for next one km what is the average speed of the car

Answer 1

For 1st Km

Given - speed = 60 km/hr and distance = 1 km

Time = distance/speed = 1/60 Km/hr

For next 1 Km

Given - speed = 40 km/hr and distance = 1 km

Time = distance/speed = 1/40 Km/hr

Average Speed = Total Distance / Total Time

                        = (1 + 1) / (1/60 + 1/40)

                        = 2 * 2400/100

                        = 48 Km/hr

Answer - The average speed of the car is 48 Km/hr

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