A. 14 km

B. 15 km

C. 16 km

D. 17 km

Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 sec. what is the length of the of the fast train

A and B are two stations 300 km apart. Two trains T_{1} and T_{2} start from A and B respectively, towards each other at the same time. T_{1} reaches B nine hours and T_{2} reaches A four hours after they meet. Find the difference between the speeds of T_{1} and T_{2}

A car travels from P to Q at a constant speed. If its speed were increased by 10 km/hr, it would have taken one hour lesser to cover the distance. It would have taken further 45 minutes lesser if the speed was further increased by 10 km/hr. What is the distance between the two cities?

Two trains are running in opposite directions with the same speed. If the length of each train is 120 meters and they cross each other in 12 sec, then the speed of each train (in km/hr) is:

P can lay railway track between two stations in 16 days. Q can do the same job in 12 days. With the help of R, they completes the job in 4 days. How much days does it take for R alone to complete the work?