An elevator descends into a mine shaft at the rate of 7m per minute .If it descent starts from 20 m above the ground level ,find the time taken by the elevator to reach -400m.
An elevator descends into a mine shaft at the rate of 7m per minute .If it descent starts from 20 m above the ground level ,find the time taken by the elevator to reach -400m.
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Verified answer
Starting value :rate :
setup an equation and solve
minutes
Verified answer
The elevator starts from 20 m above the ground.Therefore , total distance to be covered=(400+20)m=420 m.
Speed=7 m/min.
Therefore, time=D/S
=420/7 min
=60 min
=1 hr
Ans>The time taken is 1 hour.