A walks around a circular field at the rate of one round per hour while B runs around it at the rat
A walks around a circular field at the rate of one round per hour while B runs around it at the rate of six rounds per hour. They start at same point at 7:30 am. They shall first cross each other at?
7:15 am
7:30 am
7: 42 am
7:20 am
7:50 am