If two dogs start running in opposite directions on a circular path of diameter 7 m with the speed 2.5 m/sec. and 3 m/sec., then how long will they take to be at maximum distance?

Two trains, each of length 150 metres, are moving in opposite directions with equal speed of 90 km per hour. The time taken by the trains to cross each other will be

A train of length 140 m is running at a speed of 60 km/hr and a dog is running in the same direction parallel to the train at a speed of 18 km/hr. The train will cross the dog in

Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:

Two goods train each 500 m long, are running in opposite directions on parallel tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver…

A train of length 140 m is running at a speed of 60 km/hr and a cat is running in the same direction parallel to the train at a speed of 18 km/hr. The train will cross the cat in –