Arihant Expert Team Solutions for Chapter: Speed, Distance and Time, Exercise 1: Practice Exercise

A truck covers a distance of $640 \mathrm{km}$ in $10 \mathrm{h}$. A car covers the same distance in $8 \mathrm{h}$. What is the respective ratio between the speed of the truck and the car?

Truck covers a certain distance in $12 \mathrm{h}$ at the speed of $70 \mathrm{km}/\mathrm{h}$. What is the average speed of a car which travels a distance of $120 \mathrm{km}$ more than the truck in the same time?

Two trains of lengths $70 \mathrm{m}$ and $90 \mathrm{m}$ are moving in opposite directions at $10 \mathrm{m}/\mathrm{s}$ and $6 \mathrm{m}/\mathrm{s},$ respectively. Find the time taken by trains to cross each other?

When the speed of a boat in still water is $4 \mathrm{km}/\mathrm{h}$ and the rate of stream is $\text{2 km/h}$, find upstream speed of the boat?

If the speed of a swimmer in still water is $9 \mathrm{km}/\mathrm{h}$. Find the downstream speed of the swimmer, when the river is flowing with a speed of $6 \mathrm{km}/\mathrm{h}$:

A swimmer's speed downstream is $11 \mathrm{km}/\mathrm{h}$ and speed of the stream is $1.5 \mathrm{km}/\mathrm{h}$. Find the upstream speed of swimmer?

Sameer can row a certain distance downstream in $24 \mathrm{hr}$ and can come back covering the same distance in $36 \mathrm{hr}$. If the stream flows at the rate of $12 \mathrm{km}/\mathrm{hr}$, find the speed of Sameer in still water.

Keshav can row $60 \mathrm{km}$ downstream and $36 \mathrm{km}$ upstream, taking $10 \mathrm{hr}$ each time. What is the velocity of the current?