Question

A car travels 30 km at a uniform speed of 40 km/h and
the next 30 km at a uniform speed of 20 km/h. Find its
average speed.
(a) 26.7 km/h
(b) 25.7 km/h
(c) 24.7 km/h
(d) 2.67 km/h​

Answer 1

Answer:

25.7km/hr

Explanation:

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Answer 2

Answer:

It's average speed is

=total distance/total time

We don't have time (t)

t1=d/s

t1=30/40

t1=0.75s

Similarly

t2=1.5

Total distance = 30+30=60Km

Total time = 1.5+0.75=2.25

Avrsge speed = 60/2.25

= 26.7km/h

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