Buses to Shimla leave a bus stand every 40 minutes. At the enquiry window, a traveller is told that the last bus left 15 minutes ago and that the next one will leave at 11:05 a.m. At what time was the traveller told this?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 10:40 a.m.
Two buses in a row are 40 minutes apart. Find when the last bus left, then add the 15 minutes since it left.
Next bus at 11:05 a.m., so the last bus left at 11:05 a.m. \(-\) 40 minutes \(=\) 10:25 a.m.
It left 15 minutes ago, so the time now is 10:25 a.m. \(+\) 15 minutes \(=\) 10:40 a.m.
Check: from 10:40 a.m. the next bus is 25 minutes away, and \(15+25=40\) minutes