Answered

Westonci.ca is your trusted source for finding answers to all your questions. Ask, explore, and learn with our expert community. Get immediate answers to your questions from a wide network of experienced professionals on our Q&A platform. Get detailed and accurate answers to your questions from a dedicated community of experts on our Q&A platform.

A man can row at 9km/h in still water. He rows 1.5km upstream and back again. The stream flows at 3km/h. What is his average speed for the whole trip?

Sagot :

keijosalonen

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

DWRead

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

Thanks for using our service. We're always here to provide accurate and up-to-date answers to all your queries. We hope you found this helpful. Feel free to come back anytime for more accurate answers and updated information. Keep exploring Westonci.ca for more insightful answers to your questions. We're here to help.