Speed

One crocodile says something to its friend $105 \mathrm{km}$ away. How long will it take for the friend to hear him? The speed of sound in water is $1500 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$.

A bullet is fired in the air at a distance of $588 \mathrm{m}$ from a gun. The sound of the gun is heard after $6 \mathrm{seconds}$. What is the speed of sound?

A bus started at $7:30 \mathrm{a}.\mathrm{m}$ with the speed of $50 \mathrm{km}/\mathrm{h}$. After one and half hour another bus started from the same point and on the same route at the speed of  $60 \mathrm{km}/\mathrm{h}$. At what distance from the starting point will both the buses meet?

The average speed of a car that covers a distance of $150 \mathrm{km}$ in $3 \mathrm{h}$ is 

Which of these cannot be a unit of speed?

A man standing on a platform $225 \mathrm{m}$long notices that a train travelling at a uniform speed him in $6 \mathrm{s}$ and passes by the platform in $21 \mathrm{s}$. Find (i) the length of the train and (ii) the speed of the train. 

The longer a body takes to change its position, the faster is its speed.

The given table shows the speed of a car and the time it took to cover a distance. What is the value of $\mathrm{X}$? 

A car starts from Pune and covers a distance of $50 \mathrm{km}$ in two hours. Then the speed of car, slowed down, it covered a distance of $160 \mathrm{km}$ in four hours. Find the average speed of a car. 

If a scooterist drives at the rate of$24 \mathrm{kmph}$, he reaches his destination $5 \mathrm{minutes}$ too late; if he drives at the rate of $30 \mathrm{kmph}$, he reaches his destination$4 \mathrm{minutes}$ too soon. Then his destination is at a distance of 

What do you mean by average speed?

What is the speed of an ant that covers a distance of $100 \mathrm{cm}$ in $50 \mathrm{s}$?

Given the distance travelled and time taken, which formula will you use to calculate speed?

What is speed?

What is the basic unit of speed?

How can you decide if an object is moving slower or faster than another?

Approximately what speed can be attained by rockets used to launch satellites?

The distance covered by an object in unit time is known as its _____

The distance covered by an object in unit time is known as its _____

Object A covers the same distance as object B in half the time. What is the speed of A in relation to B?