Question

a boat travels 60 miles to an island and 60 miles back again. The return trip is 3 mph slower than the speed on the way out. The total time of the trip took 9 hours. Find the speed going to the island and the speed of the return trip.

Answer 1

let the rate took when travelling to the island be r. So,the rate for return trip is r-3.
time taken to the island=60/r
time taken back from island=60/r-3
60/r+60/r-3 =9=total time
find L.C.D ,
so after solving,u get r=15mph
speed to the island=15mph
speed from island =15-3=12mph
u can check ur answer.