Question

My motor boat normally travels at 24 km h-1 instill water. One day I travelled 36 km against a constant current in a river. If I had travelled with the current, I would have travelled 48 km in the same time. How fast was the current?

Answer 1

36=v-c

48=v+c

36+c=v

48-c=v

36+c=48-c

2c=48-36

2c=12

C=6