A car covers a distance of 715 km at a constant speed. If the speed of the car would have been 10 km/hr more, then it would have taken 2 hours less to cover the same distance. What is the original speed of the car?

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)