Question

Guys please help me
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Answer 1

S = V T distance = speed * time

S1 = 20 * T1 = S/4 T1 = S / 80

S2 = 30 * T2 = 3 S / 4 T2 = S / 40

V = S / T = S / (T1 + T2)

T1 + T2 = S (1/40 + 1/80) = 120 S / 3200 = .0375 S

V = S / (.0375 S) = 26.7 average speed