Cruise liner

The cruise liner runs along the river between points A and B. The journey downstream takes 40 minutes and 1 hour upriver. The flow rate of the river is 3 km/h. What is the speed of a cruise liner?

Correct answer:

v =  15 km/h

Step-by-step explanation:

t1=0:40=0 hr 40 min =0+6040=0.6667 hr0.6667 t2=1 h  (v+3) t1=(v3) t2 (v+3) 0.66666666666667=(v3) 1  0.333333v=5  v=0.333333335=15  v=15=15 km/h



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