Question

An aeroplane was flying at a height of $1600$ m. From the time it started to land, it made a change of $70$ m in every minute. How many minutes will it take to descend to height of $200$ m?

Answer 1

For $1$ min it will descent by a height of $70m$

To descend to a height of $200m$ it should descend a height of $1600-200=1400m$

No. of minutes it will take$=\frac{1400}{70}$

$=20$ min