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according to the given condition :

6am to 9 pm=15 hrs

in one hour the clock gain 2 mins

therefore,

let the clock gain a mins in 15 hours

1hour=2min

15hours=amins

a=15x2

=30 mins

ans:the clock will gain 30 mins in 15 hours

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Q: A clock shows the time as 6 am if the minute hand gains 2 minutes every hour. how many minutes will the clock gain by 9 pm?
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