A man M1 of mass 80kg runs up a staircase in 15s. Another man M2 also of mass 80kg runs up the same staircase in 20s. The ratio of the powers developed by them will be
A
1
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B
43
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C
169
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D
None of these
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Solution
The correct option is B43 Since the length of staircase is same, work done to run up the staircase is same
Hence the power will be inversely proportional to time ∴P∝1t ⇒P1P2=t2t1