Find the ratio of the following :The speed of cycle is 15km per hour to the speed of scooter 30km per hour.
Find the ratio of the following: Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.
Harshvardhan walks from home to school with a speed of 4 km per hour and returns home with 2km per hour . Find the average speed of the whole journey?