Question

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According to class 8 ....


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Remember answer according to class 8.....​

Answer 1

Answer:

Step-by-step explanation:

Hey mate

◆ Answer -

Distance travelled upstream = 1.5 km

◆ Explanation -

Let s be the distance man go to. Also vm amd vr be velocity of man and that of riverstream respectively.

During upstream journey,

t1 = s / (vm-vr)

t1 = s / 3

During downstream journey,

t2 = s / (vm+vr)

t2 = s / 5

Total time taken is 48 min,

t = t1 + t2

0.8 = s/3 + s/5

0.8 = s × (3+5)/(5×3)

s = 1.5 km

Therefore, the man went 1.5 km upstream.

Answer 2

Answer:

during upstream

t'= s/(vm-vr)

t' = s/3

and during downstream

t"= s/(vm+vr)

t"= s/5

now total time

t= t'+t"

t= s/3+s/5

given time= 0.8

0.8= 8s/15

8s= 12

s= 3/2

s= 1.5 km

hope it helps u