Two contestants run in a 3-kilometre race along a circular course of length 300 metres. If their speeds are in the ratio of 4 : 3, how often and where would the winner pass the other? (The initial start-off is not counted as passing.)

A and B run a 5 km race on a round course of 400 m. If their speeds be in the ratio 5 : 4, how often does the winner pass the other?

Two men, A and B run a 4 km race on a course 0.25 km round. If their speeds are in the ratio 5 : 4 , how often does the winner pass the other ?

Two men,A and B, run a 4km race on a circular course of (1)/(4)km. If their speeds are in the ratio of 5:4, how often does the winner pass the other? (A) Once (B) Twice (C) Thrice (D) None of these

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If lengths and radii of the wires are in the ratio of 4 : 3 and 2 : 3 , then ratio of the currents passing through the wires will be

One train runs from station A and B and the other from station B to A. They both start simultaneously and meet cross each other at a particular point on the route. Their speeds are in the ratio 4:3. After crossing each other the train from A to B takes 5 hours to complete the leftover 200km of journey. The speed of train from B to A after crossing reduced by 5 km//h and it covered the leftover distance in 12 hours. What is the total distance between A and B?