Question

20. A motorboat goes downstream in river and covers a distance between two
coastal towns in 5 hours. It covers this distance upstream in 6 hours. If the speed
of the stream is 3 km/hr, find the speed of the boat in still water.
UN मोटरबोट नदी में नीचे की ओर जाती है और 5 घटे में दो टीश शाह ३ - - _ __​

Answer 1

Answer:

Required speed of the boat is 33km/hr

Step-by-step explanation:

Let the speed of the boat in still water = xkm/hr

Speed of the boat downstream =(x+3)km/hr

Time taken to cover the distance = 5 hrs

Distance covered in 5 hrs =(x+3)×5

Speed of the boat up stream =(x−3)km/hr

Time taken to cover the distance = 6 hrs

Distance covered in 5 hrs =6(x−3)

Distance between two coastal towns is fixed .

According to the question

=> 5(x+3)=6(x−3)

=> 5x+15=6x−18

=> −x=−33

x=33

Required speed of the boat is 33km/hr