Question
A boat can cover 200 km in downstream in 10 hours and
150 km in upstream in 15 hours. Find the distance travelled by the boat in still water in 5 hours.Solution
Downstream speed of the boat = 200/10 = 20 km/hr Upstream speed of the boat = 150/15 = 10 km/hr Speed of boat in still water = (20 + 10)/2 = 15 km/hr Distance travelled by the boat in still water in 5 hours = 15 × 5 = 75 km
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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