Question
Boat βAβ can cover 160 km in still water in 8 hours.
In still water, if the ratio of the speed of boat βAβ to that of βBβ is 4:3 and the speed of stream is 3 km/hr then find the time taken by boat βBβ to cover the 234 km in downstream.Solution
Speed of boat βAβ in still water = 160/8 = 20 km/hr Speed of boat βBβ in still water = 20 Γ (3/4) = 15 km/hr Downstream speed of boat βBβ = 15 + 3 = 18 km/hr Time taken by boat βBβ to cover 234 km in downstream = 234/18 = 13 hours
Statements:
Some P are Q
All Q are R
Some R are S
Conclusions:
I. Some R are not P
II. All R are P
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