Question
John travelled a total distance of 432 km. He covered
5/8 of this distance at a constant speed of 30 km/h. To complete the entire journey in 13.5 hours, what speed must he travel the remaining distance at?Solution
(5/8) of 432 km = 270 km So, time taken to travel 270 km = 270 ÷ 30 = 9 hours Remaining distance = 432 - 270 = 162 km Remaining time = 13.5 - 9 = 4.5 hours So, speed at which remaining distance is to be travelled = 162 ÷ 4.5 = 36 km/h
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