A teain tramels from city `A` to city `B` with constant speed of `10 m s^(-1)` and returns back to city `A` with a constant spiid of `20 m s^(-1)`. Finde its average speed during its entire journey.

A train travels from city A to city B with constant speed of 10 m s^(-1) and returns back to city A with a constant speed of 20 m s^(-1) . Find its average speed during its entire journey.

A motorcyclist drives from A to B with a uniform speed of 30 km h^(-1) and returns back with a speed of 20 kmh^(-1) . Find its average speed.

A motorcyclist drives from A to B with a uniform speed of 30 km h^(-1) and returns back with a speed of 20 kmh^(-1) . Find its average speed.

A body travels along a straight line for the first half of the total time with a constant speed of 20 m s^(-1) and for the second half of the total time with a constant speed of 30 m s^(-1) . Find the average speed of the body.

A motorcylist drives from A to B with a unit speed of 30 kmh^-1 and returns back with a of 20 kmh^-1 . Find its average speed.

A boy goes from his house to school by bus at a speed of 20 km h^(-1) and returns back through the same route at a speed of 30 km h^(-1) . The average speed of his journey is :

A bus travel its onward journey with a constant speed of 30km//hr and its return journey with a constant speed of 60km//hr .the average speed for its entire journey is A. 90 k m / h r B. 45 k m / h r C. 40 k m / h r D. 15 k m / h r

A person goes from A to B with a speed of 30 km/h. He comes back from B to A with a speed of 20 km/h. What is his average speed for the entire journey ?

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?