Question 818459
s = d / t
t = d / s
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outbound:
ta = 180 / 70
ta = 18/7 hours
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return:
tb = 180 / 60
tb = 18/6 hours
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total time:
T = ta + tb
T = 18/7 + 18/6
T = 6(18/42) + 7(18/42)
T = (108/42) + (126/42)
T = (234/42)
T = 5.5714 hours
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average speed:
s = d / t
s = 360/(234/42)
s = 64.615 kph
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