Question

an elevatetor descends into a coal mine at the rate 5 m/min • if the descends starts from 20 m above the ground level ,how long will it take to reach - 250m?​

Answer 1

$\bold\red{\underline{\underline{Answer:}}}$

$\bold\green{\underline{\underline{Solution:}}}$

$\bold{Rate \ of \ descend(speed)= 5m \ min^{-1}}$

.....[Given]

$\bold{Total \ distance= 20 +250 =270m}$

$\bold{Time= Distance÷speed}$

$\bold{Time= \frac{270}{5}}$

$\bold{Time = 54 \ minutes}$

$\bold\red{The \ elevator \ will \ take \ 54 \ minutes}$

$\bold\red{to \ reach \ -250m}$