Question

5. A man can row downstream and covers 12 km in 3
hours. He covers the same distance upstream in 6
hours. What is the difference in the distance, rowing
upstream and rowing in still water for a period of 5
hours?
a). 15 km
b). 10 km
7
c). 5 km
d). 7.5 km​

Answer 1

Answer:

10km

Step-by-step explanation:

let the speed of boat be x km/h

speed still water be y km/h

speed up stream= x-y

speed down stream= x+y

s=d/t

x+y=12/3

x-y=12/6

x=3

y=1

Now, time=5 hrs

d=s×t

Up stream:

D1=4×5

=20km

D2=2×5

=10km

Difference in distance:

20-10= 10km

Ans