Question
A man travels a distance of 24 km at 6 kmph. Another distance of 24 km at 8 kmph and a third distance of 24 km at 12 kmph. His average speed for the whole journey (in kmph) is
Answer: Option D
Answer: (d)Using Rule 2,Total distance= 24 + 24 + 24 = 72 km.Total time= $(24/6 + 24/8 + 24/12)$ hours= (4 + 3 + 2) hours = 9 hoursRequired average speed= $\text"Totaldistance"/ \text"Total time" = 72/9$ = 8 kmph.
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Answer: (d)Using Rule 2,Total distance= 24 + 24 + 24 = 72 km.Total time= $(24/6 + 24/8 + 24/12)$ hours= (4 + 3 + 2) hours = 9 hoursRequired average speed= $\text"Totaldistance"/ \text"Total time" = 72/9$ = 8 kmph.
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