Question

with explanation pls​

Answer 1

Answer:

37.5km/h

Explanation:

D1 = 20km

S1 = 50km/h

then, T1 = D1/S1

= 20/50 = 2/5h

Now, D2 = 20km

S2 = 30km/h

then, T2 = D2/S2

= 20/30 = 2/3h

total distance = D1 + D2 = 40km

total time = 2/5 + 2/3 = 6+10/15 = 16/15h

avarage speed = td/tt

= 40/(16/15) = 40*15/16

= 37.5 km/h

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