Question 1173675
One way is the cabin cruiser has a 15 km head start and is being caught at 10 km/h, so it is 1.5 hours chase and 2.5 hours after leaving the harbor, or 37.5 km.
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another way is cruiser has gone 15km/h*x h km.
the speed boat has gone 25 km/h (x-1) h km.
Set those equal to each other'
15x=25x-25
10x=25
x=2.5 hours, time the cabin cruiser has gone 15*2.5 or 37.5 km and the speed boat 25*1.5 or 37.5 km.