An airplane was flying at a height of $1700$ m. To land, it started descending by losing height of $80$ m every minute. How long(in minutes) will it take to descend $1000$ m?

12.5

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15.5

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17.5

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13.5

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Solution

The correct option is B $12.5$
To descend $80$ m it takes $1$ minute
=>To descend $1 m$ , it will take $\frac{1}{80}$ minute
=>To descend $1000 m$ , it will take $\frac{1000}{80}$ minute
$= 12.5$ minutes

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An airplane was flying at a height of 1700 m. To land, it started descending by losing height of 80 m every minute. How long(in minutes) will it take to descend 1000m?

The correct option is B 12.5To descend 80m it takes 1 minute=>To descend 1m, it will take 180 minute=>To descend 1000m, it will take 100080 minute=12.5 minutes

An airplane was flying at a height of $1700$ m. To land, it started descending by losing height of $80$ m every minute. How long(in minutes) will it take to descend $1000$ m?

The correct option is B $12.5$
To descend $80$ m it takes $1$ minute
=>To descend $1 m$ , it will take $\frac{1}{80}$ minute
=>To descend $1000 m$ , it will take $\frac{1000}{80}$ minute
$= 12.5$ minutes