A car during its journey travels 30 minutes at a speed of 40 kmph, another 45 minutes at a speed of 60 kmph, and 2 hours at a speed of 70 kmph.The average speed of the car is A. 63.07 kmph B. 64 kmph C. 62.02 kmph D. None of these Answer Workspace Report Discuss Answer with explanation Answer: Option A Explanation First car travels 30 min at speed of 40 kmph distance = 40 x 1/2 = 20 m Then car travels 45 min at a speed of 60 kmph distance = 45 min at speed of 60 kmph distance = 60 x 3/4 = 45 m at last it travels 2 hours at speed of 70 kmph distance = 70 x 2 = 140 m Total distance = 20 + 45 + 140 = 205 Total time= 1/2 + 3/4 + 2 = 3.25 Average speed of the car = 205/3.25 = 63.07 Workspace
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