The own speed of the motor boat is 28.6 km / h; the speed of the river is 2.5 km / h. How far will the boat sail upstream of the river in 30 minutes?
1) Let’s find out what speed the motor boat developed against the river flow, if it is known that the speed of the motor boat was 28.6 km, and the speed of the river flow was 2.5 km / h.
28.6 – 2.5 = 26.1 km / h.
2) Find out what distance the motor boat will cover in 30 minutes, if it is known that this is half the way in 1 hour, and in an hour the motor boat moved 26.1 km.
26.1 / 2 = 13.05 km.
Answer: a motor boat will cover 13.05 km in half an hour.
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