Question

A bus travels a distance of 180 km with a speed of 60 km/hr and returns with the speed of 30 km/hr. Calculate the average speed for the entire journey

Answer 1

The average speed for the entire journey is 40 km/ hr.

Explanation:

The average speed of the body is given as

$v_{avg} =\frac{s}{t}$

Here s is the total distance traveled by the bus in entire journey and t is the total time.

For distance 180 km travel by the bus with 60 km/hr, time taken is

$t_1=\frac{180km}{60km/hr}$

= 3 hr.

For return journey distance 180 km travel by the bus with 30 km/hr, times taken

$t_2=\frac{180km}{30km/hr}$

   = 6 hr

So, total time taken, t = 3 hr + 6 hr = 9 hr.

and total distance traveled, s = 180 km + 180 km =360 km.

Therefore, average speed is

$v_{avg} =\frac{360km}{9hr}$

        = 40 km/hr.

Thus, the average speed for the entire journey is 40 km/ hr.

#Learn More: speed, distance and time.

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Answer 2

Answer:

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