Question

A radius of the wheel is 70 cm,what is roation of the wheel

Answer 1

First you have to find out how to calculate the circumference in cm from a radius in cm.

Then convert the circumference in cm to a circumference in Km.

Now you can work out how many times that circumference fits into 60 Km.

Now you know how many times the wheel rotates in an hour at 60 Km/h.

If you know how many times it rotates in an hour you can calculate how many times it rotates in a minute.

This may take some googling and research and effort for each step, but think of it as a learning experience.