Question

3. Abdul, while driving to school, computes the average speed for
his trip to be 20 km h'. On his return trip along the same
route, there is less traffic and the average speed is
30 km h . What is the average speed for Abdul's trip?
numerical ​

Answer 1

Explanation:

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Answer 2

Answer:

24

Explanation:

speed=distance/time

let the distance be s,speed be v and time is t,then

s1=s2=S

v1=20

v2=30

and time is t1 and t2

putting the values

20=S/t1 t1=S/20

30=S/t2 t2=S/30

now average speed will be = average distance/average time

i.e.

v=s1+s2/t1+t2

=S+S/t1+t2

=2S/(S/20+S/30)

=2S/(5S/60)

=2S/(S/12)

=2/1/12

=2×12

=24

i.e. average speed is 24 km/h