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Sagot :
Answer: average speed is 8 km/h
Step-by-step explanation: in upstream his speed is 9 km/h -3km/h.
So his speed is 6km/h and he needs time t= s/v= 1.5 km: 6 km/h = 0.25 h
Downstream his speed is 9 km/ + 3km/h = 12km/h and time is
1.5 km:12km/h= 1/8 hours= 0.125 h
Average speed v = s/t = 3km: (0.25 + 0.125 ) h = 8 km/h
Answer:
Step-by-step explanation:
Rowing against the current, he travels 9-3 = 6 km/h.
1.5 km × (1 h)/(6 km) = ¼ h
It takes him ¼ h to row 1.5 km upstream.
Rowing with the current, he travels 9+3 = 12 km/h.
1.5 km × (1 h)/(12 km) = ⅛ h
It takes him ⅛ h to row 1.5 km downstream.
Average speed = (3 km)/(¼+⅛ h) = 8 km/h
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