An elevator descent into a mine sharft at the rate of 5m/min . If the descent start from 15m above a ground level, how long will it take to reach 250 m ?
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Step-by-step explanation:
total distance to be covered
=15+250
=265m
time taken to cover 5m= 1 min
time taken to cover 1m= 1/5 min
time taken to cover 265m= (1×265)/5min
=53 min –Ans
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