1.

7. A car moves through 20 km at a speed of 40 km/h,and the next 20 km at a speed of 60 km/h. Calculateits average speed​

Answer»

Answer:

48kmph

Explanation:

1st CASE:

d= 20km

s1= 40kmph

2nd case:

d=20km

s2= 60kmph

for EQUAL distance...

Avg.speed= 2/((1/s1)+(1/s2))

= 2/((1/40)+(1/60))

=(2*120)/5

=240/5

=48 KMPH



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