Question
A car travels from point A to point B in 4 hours,
covering a distance of 180 km. On the return journey, the speed is reduced by 20%. How much time does the car take to travel from point B to point A?Solution
Speed on the way from A to B = Distance / Time = 180 / 4 = 45 km/h. Reduced speed for the return journey = 45 * (1 - 0.20) = 45 * 0.80 = 36 km/h. Time taken for the return journey = Distance / Speed = 180 / 36 = 5 hours. Answer: b) 5 hours
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