Question

a boat covers certain distance downstream in 3hr and same distance upstream in 5 hours

Answer 1

Answer:

ok here's your answer

Step-by-step explanation:

d = (Vb-Vc)*T1 = (Vb+Vc)*T2

(Vb-3)*3 = (Vb+3)*2

3Vb-9 = 2Vb+6

Vb = 15 km/h.

Answer 2

Answer:

19.5 km/hr

Let the speed of boat in still water be x km/hr and the distance be y km.

Speed in downstream = (x+1.5) km/hr

Speed in upstream (x−1.5) km/hr

According to the question,

x+1.5

y

= 3 .(1)

x−1.5

y

=

2

7

.(2)

On dividing equation (1) by (2),

x+1.5

x−1.5

=

7

3×2

=

7

6

⇒7x−10.5=6x+9⇒x=10.5+9=19.5km/hr

Step-by-step explanation:

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