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A bus for Shimla leaves every thirty minutes from a bus-stand. An enquiry clerk told a passenger that the bus had already left ten minutes ago and the next bus will leave at 9:35 am. At what time did the enquiry clerk give this information to the passenger ?

  • A.9:15 am
  • B.9:05 am
  • C.9:20 am
  • D.9:08 am

Answer: A

The clerk gave the information at 9:15 am.

Buses leave every 30 minutes, so the bus before the 9:35 one left at 9:05. The clerk said that bus had left ten minutes earlier:

\[ 9{:}05 + 10 \text{ min} = 9{:}15 \]

9:05 is the departure time of the previous bus, not the time of speaking, and 9:20 and 9:08 do not fit both facts.

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