The boat covered 126 km. downstream in 7 hours, and upstream in 9 hours. How long will the raft cover the same distance?

univerkov | December 21, 2020 | education

first we find the speed of the boat downstream for this we need 126: 7 = 18 km / h
then we find the speed of the boat against the stream 126: 9 = 14 km / h
now we are looking for the river speed (18 – 14): 2 = 4: 2 = 2 km / h
we will find out in how many hours the raft will sail 126 km
126: 2 = 63 h
the answer in 63 hours the raft will sail 126 km

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