Question 23
The diagram below shows a river with two bridges at $A$ and $B$ that are $2$ km apart. The water flows from west to east at a constant speed.
A man rowed a boat upstream. He dropped his water bottle at $A$ but he only noticed it at $C$ after rowing for another $20$ minutes upstream from $A$. He immediately turned back and rowed his boat downstream, and was able to pick up his water bottle at $B$. Assume that the man rowed his boat at a constant speed.
Find the speed of the water flowing in the river in km/h.
A man rowed a boat upstream. He dropped his water bottle at $A$ but he only noticed it at $C$ after rowing for another $20$ minutes upstream from $A$. He immediately turned back and rowed his boat downstream, and was able to pick up his water bottle at $B$. Assume that the man rowed his boat at a constant speed.
Find the speed of the water flowing in the river in km/h.