Question

A boat covers the distance between two points in a river in 12 hrs and 8 hrs upstream and downstream
respectively. Then time required for the boat to cover this distance in still water is
[ 1
a) 4.S hr
b) 9.6 hr
c) 10.8 hr
d) none​

Answer 1

Explanation:

I send u answer then you saw my answer

Answer 2

Answer:

9.6 hr

Explanation:

Let the time required in still water be t and speed of boat be v and speed of stream be v',

For downstream= d(v+v')8.......1

For upstream=d(v-v')12........2

For still water d=vt..........3

Solving 1 and 2 we get

3(v-v')=2(v+v')

v=5v'........4

Putting value of v in 1 and value get from 3

vt=(v+v/5)8

t=6x8/5=9.6hr