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 in the same direction from the same point at 7.30 a.m. They shall first cross each other at:

A train of length $110 \mathrm{m}$, is moving at a uniform speed of $132 \mathrm{km}/\mathrm{hr}$. The time required to cross a bridge of length $165 \mathrm{m}$, is

A passenger train and a goods train are running in the same direction on parallel railway tracks. If the passenger train now takes three times as long to pass the goods train, as when they are running in opposite directions, then what is the ratio of the speed of the passenger train to that of the goods train? (Assume that the trains run at uniform speeds)