1.

Answer this plzzzzzzzzA stream flows from A to B a distance of 30 km.at 2 km/hr and a man can row up and down in 8 hrs . Find the rate of the man in still water .​

Answer»

Answer:

Brainly.in

What is your question?

1

Secondary School Math 5 points

A stream FLOWS from A to B a distance of 30 km at the rate of 2km/h and a man can row up and down in 8 hours.find the SPEED of the man in still watet.

Ask for details Follow REPORT by Huda1881 06.01.2019

Answers

Me · Beginner

Know the answer? Add it here!

hemangmehta63 Virtuoso

Answer:

8km/h

Step-by-step explanation:

Let the speed of man in still water be 'x'.

Distance = 30km

Speed of stream = 2km/h

Speed = Dist./Time

Time = Dist./speed

8hrs. = 30/x-2 + 30/x+2

8 = 30x + 60 + 30x - 60/x^2 - 4

8x^2 - 32 = 60x

0 = 8x^2 - 60x - 32

0 = 2x^2 - 15x - 8

0 = 2x^2 +x - 16x - 8

0 = x(2x + 1) - 8 (2x+1)

0 = (2x+1)(x-8)

x = -1/2 ; x = 8

As speed can't be NEGATIVE,

x = 8km/h.



Discussion

No Comment Found

Related InterviewSolutions