The boat goes 80 km along the lake in 2 hours. what distance he covers in the same time along the river

The boat goes 80 km along the lake in 2 hours. what distance he covers in the same time along the river, the speed of which is 1 km / h, if the boat moves: 1) along the river 2) against the current

Let’s calculate the boat’s own speed. Let’s divide the distance that he covered – 80 kilometers by the time – 2 hours:

80 kilometers: 2 hours = 40 kilometers / hour.

The boat’s own speed is 40 kilometers per hour.

Let’s calculate the speed of the boat downstream:

40 kilometers per hour + 1 kilometer per hour = 41 kilometers per hour.

Let’s calculate how far the boat will pass in 2 hours downstream:

41 kilometers per hour * 2 hours = 82 kilometers.

Boat speed upstream:

40 – 1 = 39 kilometers per hour.

Let’s calculate how far the boat will go against the river flow:

39 kilometers per hour * 2 hours = 78 kilometers.

Answer: the boat will go 82 km downstream, and 78 km against it.