Question
A man drove at a steady speed of 48 km/h for 5 hours,
and then continued at a constant speed of 40 km/h for the next 4 hours. What is his average speed for the whole journey?Solution
Total distance travelled = 48 X 5 + 40 X 4 = 240 + 160 = 400 km Total time taken = 5 + 4 = 9 hours So, average speed = 400 ÷ 9 = 44(4/9) km/h Hence, option b.
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