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Every ten minutes, a bus departs from Mu...

Every ten minutes, a bus departs from Mumbai from Pune. Also every 15 minutes a bus departs from mumbai for thane. At 9am two buses simultaneously depart from Mumbai for Pune and Thane.
What will be the next instance of time when two buses will simultaneously depart from Mumbai for pune and thane

A

9:30am

B

10:15am

C

11:15am

D

11:20am

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