A boy goes from home to school within time t = 2.0 minutes, and back – 2 times longer.

univerkov | January 4, 2021 | education

A boy goes from home to school within time t = 2.0 minutes, and back – 2 times longer. Find the average speed of the boy if the distance from home to school is l = 0.60 km.

V (cf) = whole S / all t
t = t1 + t2 = t1 + 2 t1 = 3 t1
t2 = 2 t1
t = 3 * 2 * 60 = 360 s
(Multiplied by 60 to get seconds straight away)
0.6 km = 600m
S = S1 + S2 = 2 S1
S1 = S2 = 600m
S = 600m * 2 = 1200m
V (Wed) = 1200m / 360s = 3.3 m / s
Answer: 3.3 m / s

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