The speed of the river flow is 2 km / h and the boat’s own speed is 15 km / h. Make up expressions

| July 13, 2021 | education

The speed of the river flow is 2 km / h and the boat’s own speed is 15 km / h. Make up expressions for the following values ​​and find their values: 1) speed of the boat when moving along the river; 2) speed of the boat when moving against the stream of the river; 3) the distance that the boat will cover in 3 hours moving downstream 4) the distance that the boat will cover in 3 hours moving against the current 5) the time it takes for the boat to travel 68 km when moving along the river 6) the time it takes for the boat to travel 78 km when moving against the stream of the river 7) at a gallop speed of the boat when moving along the current is greater than its speed when moving against the course of the river.

1) Speed when moving with the flow – 2 + 15 = 17 km / h;
2) Speed when moving against the current – 15 – 2 = 13 km / h;
3) The distance that will be covered in 3 hours, moving downstream – 17 * 3 = 51 km / h;
4) The distance that will pass in 3 hours moving against the current – 13 * 3 = 39 km / h;
5) The time it takes to travel 68 km when moving downstream – 68/17 = 4 hours;
6) The time it takes to travel 78 km when moving against the stream – 78/13 = 6 hours;
7) The speed of the boat is 4 km / h more.



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