Question

a motorboat has a speed of 18 km per hour in still water it takes 3 hours more in covering a distance of 72 km upstream and downstream find the speed of the stream ​

Answer 1

Answer:

6km/hr

Step-by-step explanation:

Let speed of stream be x

Then speed of downstream will be 18+x

And speed in upstrem will be 18-x

Let t1 be the time required to go upstrem and the t2 be the time required to go downstream

Given t2-t1=3...i

t1=72/18+x.... ii

t2=72/18-x.....iii

Put ii and iii in eq i

We get x=6km/hr