Economist GMAT
From Aqua-Bella island, it is possible to reach Aqua-Marine island by either ferry A or ferry B. Ferry A sails 3 hours at 7 kilometers per hour, while ferry B takes a route that is three times longer. If ferry A is slower than ferry B by 2 kilometers per hour, how many hours longer is the journey of ferry B compared with the journey of ferry A?
A. 4
B. 7
C. 8.6
D. 9.6
E. 12.6
OA A
From Aqua-Bella island, it is possible to reach Aqua-Marine island by either ferry A or ferry B. Ferry A...
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Given that Ferry A sails 3 hours at 7 kilometers per hour, the total distance ferry covers = 3*7 = 21 kilometers.AAPL wrote: ↑Mon Aug 03, 2020 11:51 amEconomist GMAT
From Aqua-Bella island, it is possible to reach Aqua-Marine island by either ferry A or ferry B. Ferry A sails 3 hours at 7 kilometers per hour, while ferry B takes a route that is three times longer. If ferry A is slower than ferry B by 2 kilometers per hour, how many hours longer is the journey of ferry B compared with the journey of ferry A?
A. 4
B. 7
C. 8.6
D. 9.6
E. 12.6
OA A
Thus, the length of ferry B = 3*21 = 63 km.
Also, given that ferry A is slower than ferry B by 2 kilometers per hour, speed of ferry B = 7 + 2 = 9 kmpl
Thus, time taken by ferry B = 63/9 = 7 hours
Thus, compared with ferry A ferry b takes 7 – 3 = 4 hours more
Correct answer: A
Hope this helps!
-Jay
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