The motor boat sailed 1.4 hours along the river and 2.2 hours against the current.

| March 19, 2021 | education

The motor boat sailed 1.4 hours along the river and 2.2 hours against the current. What path has the boat covered during the entire movement, if the current speed is 1.7 km / h, and the boat’s own speed is 19.8 km / h?

1. Let’s find the speed of the boat along the river, if the speed of the current is 1.7 kilometers per hour, and the boat’s own speed is 19.8 kilometers per hour:

1.7 + 19.8 = 21.5 (km / h).

2. Determine the speed of the boat against the current:

19.8 – 1.7 = 18.1 (km / h).

3. Find out how many kilometers the boat sailed downstream in 1.4 hours:

21.5 * 1.4 = 30.1 (km).

4. Let’s find how many kilometers the boat sailed against the current in 2.2 hours:

18.1 * 2.2 = 39.82 (km)

5. Let’s determine how many kilometers the boat has sailed:

30.1 + 39.82 = 69.92 (km).

Answer: the boat sailed 69.92 kilometers.



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