A Bus for Delhi leaves every 30 minutes from a Bus stand. An enquiry clerk, Ramesh told Anil, a passenger that the bus has already left 10 minute ago and next bus will leave at 9 : 35 am. At what time did the enquiry clerk gives this information to Anil ?

9 : 15 am

A bus leaves every 30 mins

Ramesh told Anil that a bus has left 10 mins ago, this means that the next one has to leave after 20 mins.

Also, he told that next bus will leave at 9 : 35 am, thus after 20 minutes time will be 9:35 am. So, current time = 9:15 am

The correct answer is option (3) : 9 : 15 am