Question

Normal speed of a boat in still water is 4 times the speed of the river. The boat goes upstream and takes 4 hrs to reach q from p. By what percent should the boat increase/decrease its speed if it's required to reach p from q in exactly 3 hours?

Answer 1

Answer:

boats speed should decrease by 25%

Explanation:

because speed of boats for reaching out to the river is 4 times speed of river for 4hours

then

3hours to cover the speed of boats 4 times speed of the rivers is 3times speed of river.

hence

3×4/4=3times

therefore

4-3/4×100%

1/4×100%

=25%