【英语】流水行船问题If boat A sails from Port A to Port B which is 300

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【英语】流水行船问题
If boat A sails from Port A to Port B which is 300 km away,and the speed of water is 2.5km/h,what will be the difference in time between sailing with current and adverse current if the plane's speed with no wind is 17.5 km/h?

with current,it takes 15 hours ==> 300/(17.5+2.5)=15 hours
with adverse current,it takes 20 hours ==> 300/(17.5-2.5)=20 hours
so,the different in time is 5 hours.

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