Three city tour buses leave the bus stop at 9:00 a.m. Bus A returns in every 30 minutes, Bus B returns in every 20 minutes and Bus C returns in every 45 minutes. What is the next time, all buses will return at the same time to the bus stop?

A bus covers a 60 kilometre distance in 1 hour 30 minutes, whereas the same distance is covered by a car in 45 minutes. What is the ratio of the speed of the car to the speed of the bus?

In every 30 minutes the time of a watch increases by 3 minutes. After setting the correct time at 5 a.m. what time will the watch show after 6 hours ?

An electronic divice makes a beep after every 15 minutes , Another device makes a beep after every 20 minutes. They beeped together at 6 a.m., at what time will they next beep together ?

The bus for Chenai leaves every 30 minutes from a bus depot. The enquiry clerk told a passenger that the bus for chennai left 10 minutes ago, and the next bus will leave at 10:30 a.m. What was the time when enquiry clerk told this?

Two towns A and B are connected by a regular bus service with a bus leaving in either direction every T min A man cycling with a speed of 20 km h^(-1) in the direction A to B notices that a bus goes past him every 18 min in the direction of his motion, and every 6 min in the opposite direction. What is the period T of the bus service and with what speed (assumed constant )do the buses ply on the road?

In a call centre at New Delhi, it is observed that it gets a call at a interval of every 10 minutes from California, at every 12 minutes from Texas, at the interval of 20 minutes from Washington DC and after every 25 minutes it gets the call from London. If in the early morning at 5 : 00 a.m. It has recieved the calls simultanously from all the four destrinations, then at which time it will receive the calls at a time from all the places on the same day?