问一道英语奥数题
Ashiphadaround-tripbetweenAandB.WeknowthatfromAtoB.theshiptook6hoursandthetimeforthes...
A ship had a round-trip between A and B.We know that from A to B. the ship took 6 hours and the time for the ship to sail back to B from A is 1.5 times of the former one. If the speed of the ship on still water is 20km/h, count the speed of current.
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Suppose the speed of current is X, then we can get the equation:
(20+X)*6=(20-X)*9
X=4
(20+X)*6=(20-X)*9
X=4
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