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Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full in:
Pipe A can fill a tank in 16 minutes and pipe B can empty it in 24 minutes. If both the pipes are opened together after how many minutes should pipe B be closed, so that the tank is filled in 30 minutes?
The selling price of an article is Rs. 624 when it is sold at 30% profit. If the cost price of the article is increased by Rs. 50 and the selling price is increased by Rs. 60, then what will be the profit percentage (nearest to an integer)?
After traveling 50km, a train meets with an accident and travels at 75% of its usual Speed and reaches 45 min late. Had the accident happened 10km further on it would have reached 35 min late. Find the usual Speed?