Question
A man goes from A to B at a uniform speed of 12 kmph and returns with a uniform speed of 4 kmph His average speed (in kmph) for the whole journey is :
Answer: Option A
Answer: (a)Using Rule 5,If two equal distances are covered at two unequal speed of x kmph and y kmph,then average speed = $({2xy}/{x + y})$= ${2 × 12 × 4}/{12 + 4} = 96/16$ = 6 kmph
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Answer: (a)Using Rule 5,If two equal distances are covered at two unequal speed of x kmph and y kmph,then average speed = $({2xy}/{x + y})$= ${2 × 12 × 4}/{12 + 4} = 96/16$ = 6 kmph
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