Cruise liner

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

Correct result:

v =  15 km/h

Solution:

(v+3)•40/60=(v-3)•1

20v = 300

v = 15

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