Please help me with this question!!!

Question

Tyler rows 10 km downstream in 2 h. On the return trip, it takes him 4 h to travel 8 km. Determine his average rowing speed and the speed of the current.

Answer 1

distance=rate*time

d=rt

10=r*2

rate=5 km per hour with the current

8=r*4

rate=2 km per hour against the current

let c=rate of current

r+c=5

r-c=2

add the two equations

2r=7

r=3.5 km per hour is his average speed

3.5+c=5

c=5-3.5

c=1.5 km per hour for the rate of the current, or...

3.5-c=2

-c=2-3.5

-c=-1.5

c=1.5 km per hour again