A boat makes a 120-mile trip downstream in 3 hours but makes the return trip in 4 hours. What is the rate of the current?3 mph 4 mph5 mph
Accepted Solution
A:
With the current 40 miles per hour Against the current 30 miles per hour bv means boat velocity with NO current cv means current velocity A) bv + cv = 40 mph B) bv - cv = 30 mph Adding both equations: 2bv = 70 boat velocity with NO CURRENT = 35 miles per hour