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## Homework Statement

A man can swim through still water 4.2m/s. Suppose this man swims in a river with current 1.3 m/s. Find his average speed over a trip:

a) across the river and back

b) a certain distance downstream and back

## The Attempt at a Solution

a)

Here is a diagram I made:

Left side of picture is there, right side is back

So should I solve for x, then take x, multiply by two, then divide by two. Thats the avg speed? because the question doesn't give any distance or time, so this is all I could think of.

b) is this a vector addition question? so his avg speed would be 2.9m/s?

Thanks