In an office the working hours are 9:30 AM to 4:30 PM and in between 20 minutes are spent on lunch Find the ratio of office hours to the time spent for lunch-

A

$21:1$

B

$1:14$

C

$7:30$

D

$30:7$

Medium

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Solution

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Correct option is A)

Total time in office $=9:30to4:30=7hours$

Ratio of two quantities can be found when they are of same units.

So, $7hours=7×60=420minutes$ Hence, ratio $=20min420min =21:1$