Question
A car travels from town A to town B at 40 km/h and
returns from B to A at 50 km/h. If the distance between A and B is 100 km, find the average speed for the whole journey.Solution
Distance A to B = 100 km, B to A = 100 km Total distance = 200 km Time from A to B = 100 / 40 = 2.5 hours Time from B to A = 100 / 50 = 2 hours Total time = 2.5 + 2 = 4.5 hours Average speed = Total distance / Total time = 200 / 4.5 = 44.44 km/h Answer: 44.44 km/h
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