A man takes 6 hours to go to a place and come back by walking both ways. He could have saved 2 hours by riding both ways. The distance covered in the whole journey is 20 miles. What is the average speed for the whole journey i f he go es by walking and comes back by riding?

Rohan walks around a circular field at the rate of 1 round per hour while Shreyas runs around it at the rate of 5 rounds per hour. They start in the same direction from the same point at 8:30 AM. When will they first cross each other?

In covering 90 km, R takes 4 hours more than S. If R triples his speed, then he would take 2 hours less than S. What is R's original speed (in km/h)?