Give the kid a break you Guys

Man ppl on CR can really be harsh at times.

Even though this is no math forum kid.

i think the answer to this question should be 7 km/h

since we have both upstream rate and downstream rate, all you need to know is + & -

10-3 = 7

4 +3 = 7

Think of it this way, if they already gave you the speed in still water, all you had to do for downstream was add 3 km/hr to your boat's speed in still water, and for upstream substract 3 km/hr to your boat's speed in still water.

So your speed in still water is 7 km/h

Even though this is quite late

- Peace -