SOLUTION: a cruise ship left port 28 and traveled south. 1 hour later a fishing boat left, traveling at 5 km/h faster in an effort to catch up to it. after 4 hours the fishing boat caught up

Question 695957: a cruise ship left port 28 and traveled south. 1 hour later a fishing boat left, traveling at 5 km/h faster in an effort to catch up to it. after 4 hours the fishing boat caught up to it. find the cruise ships average speed
Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!
D=RT
D=R(4+1) FOR THE CRUISE SHIP.
D=(R+5)*4 FOR THE FISHING BOAT.
R(4+1)=(R+5)*4
5R=4R+20
5R-4R=20
R=20 MPH. SPEED OF THE CRUISE SHIP.
PROOF:
20(4+1)=(20+5)*4
20*5=25*4
100=100
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