Question

A train covers a distance of 20 km with a uniform speed of 60 km/h. It travels another distance of 40 km with a uniform speed of 80 km/h. Calculate the average speed of the train.

Answer 1

✰Question ✰

⋄ A train covers a distance of 20 km with a uniform speed of 60 km/h. It travels another distance of 40 km with a uniform speed of 80 km/h. Calculate the average speed of the train.

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✰Given:-

In first case

⋄ Distances covered by train =20 km

⋄ speed of train =60km/h

∴ Time =Distance /speed

⋄ t = 20/60=1/3 h

and,

In second case

⋄ Distance covered by train =40km

⋄ Speed of train =80km/h

∴ Time(t') = distance/speed

⋄ t'= 40/80=1/2 h

Now,

we know that

➧ Average speed =Total distance /Total time taken

$av.speed = \frac{20 + 40}{ \frac{1}{2} + \frac{1}{3} } \\ \\ av.speed = \frac{60}{ \frac{5}{6} } \\ \\ av.speed = 72 \: kmh {}^{ - 1}$

∴The average speed is equal to 72 km/h.

➧ Av. Speed=50

Answer 2

Answer:

average speed=50 km

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