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How many degrees does an hour hand cover...

How many degrees does an hour hand covers in 20 minutes

A

`5^(@)`

B

`10^(@)`

C

`15^(@)`

D

`20^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
As we know that the hour hand moves through `1^(@)/2` in each minute i.e. 1 minute = `1^(@)/2`.
Therefore, the hour hand moves in 20 minutes
`" "=1^(@)/2 times 20=10^(@)`.
Another way :
The hour hand moves in 1 hour = `360^(@)/12=30^(@)`
So, the hour hand moves in 20 minutes `=30^(@)/3=10^(@)`.
`" "[because` 60 minutes = 1 hour, So, 20 minutes = `1/60 times 20]`.
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