Average speed of 3 different speeds

(a) Define speed. What is the SI unit of speed ? (b) What is meant by (i) average speed, and (ii) uniform speed ?

What does the speedometer of a car measure average speed or instantaneous speed ?

The ratio of average speed, most probable speed and root mean square speed of a gas sample will be

The ratio of most probable speed, average speed and rms speed of gas molecules is………………………………

A man goes to a place at a speed of 80 km/hr and comes back with a different speed. If the average speed is 32 km/hr, then what is the return speed (in km/hr)?

The speed of a boat in upstream is 2/3 that of downstream. Find the ratio of speed of boat in still water and to the average speed of boat in downstream and upstream?

A train goes from P to Q with an average speed of u km/h and returns from Q to P with an average speed of v km/h. What is its average speed for the entire journey in km/h?

A' goes 10 km.distance with average speed of 6km/hr while rest 20 km he travels with an average speed of 15km/hr.What is the average speed of 'A' during the whole journey?