The own speed of the ship is 27 km / h, the speed of the river is 3 km / h. How much will the motor ship

| August 5, 2021 | education

The own speed of the ship is 27 km / h, the speed of the river is 3 km / h. How much will the motor ship spend on the path between the two piers, the distance between the opened 120 km, if it will sail: a) along the river; b) against the flow of the river.

1) The speed of the ship along the river will be: 27 km / h + 3 km / h = 30 km / h, since the own speed of the ship is 27 km / h, the speed of the river is 3 km / h. To find out how much the motor ship will spend on the way between two piers, the distance between which is 120 km, we will use the formula: S = v • t, ​​then t = S: v; t = 120 km: 30 km / h; t = 4 hours.
2) The speed of the motor ship against the river flow will be: 27 km / h – 3 km / h = 24 km / h. To find out how much the motor ship will spend on the way between two piers, the distance between which is 120 km, we will use the formula: S = v • t, ​​then t = S: v; t = 120 km: 24 km / h; t = 5 hours.
Answer: the motor ship will spend on the way between the two piers, sailing: a) along the river – 4 hours; b) upstream of the river – 5 hours.



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