Physics Doppler Effect Problem Help Please!?

Jasmine

New member
While anchored in the middle of the lake, you count exactly three waves hitting your boat every 10 seconds. You raise anchor and start motoring slowly in the same direction the waves are going. When traveling at 1.5m/s, you notice that exactly two waves are hitting the boat from behind every 10 seconds. What is the speed of the waves on the lake?
 
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