From the same place at 7 a.m. A started walking in the north at the speed of `4 km//hr`. After 1 hours B stated cycling in the east at a speed of `8 km//hr`. At what time they will be at a distance of 20 km apart from each other?

A train X starts from a place at a speed of 50 km/hr. After one hour, another train Y starts from the same place at a speed of 70 km/hr. After how much time will Y cross X?

R and S start walking each other at 10 AM at the speeds of 3 km/hr and 4 km/hr respectively. They were initially 17.5 km apart. At what time do they meet?

A motorcycle is moving at the speed of 25 km/hr and its speed is increased by 7 km/hr at the end of each hour. How much time it will take to cover a distance of 225 km?

Mohit starts moving from a place A and reaches the place B in 12 hours. He covers 1/5 part of the total distance at the speed of 6 km/hr and covers the remaining distance at the speed of 8 km/hr. What is the distance between A and B?

The distance between two cities A and B is 520 km. One car starts from city A towards city B with the speed of 60 km/hr. At the same time, another car starts form city B towards city A with a speed of 70 km/hr. After how many hours they will cross each other?

A man walks at a speed of 4 km/hr and runs at a speed of 8 km/hr. How much time will the man require to cover a distance of 24 km if he completes half of his journey walking and half running?