Ratio of speeds
Two trains running in opposite directions cross the man standing upon the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is
A. 1 : 3
B. 3 : 2
C. 3 : 4
D. None of these
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In travelling from city A to city B, John drove for 1 hour at 50 mph as well as for 3 hours at 60 mph. What was his average speed for the whole trip?
A salesman sells two types of trousers: cotton and woollen. A pair of cotton trousers is sold at 30% profit and pair of woollen trousers is sold at 50% profit. The salesman has computed that if he sells 100% more woollen trousers than cotton trous
When he reaches S, he stops. Let Sn be the number of distinct paths of exactly n jumps ending at S. What is the value of S2k, where k is an integer?
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The following table lists numbers of units of raw materials the manufacturer requires for each style. Assume wood costs $5 per unit, nylon costs $3 per unit, velvet costs $4 per unit, and springs cost $4 per unit.
Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes, and 10 minutes respectively. When tank is empty, all the three (3) pipes are opened. A, B and C discharge chemical solutions P,Q and R respectively. What is the p
Three persons are walking from the place A to another place B. Their speeds are in ratio of 4 : 3 : 5. The time ratio to reach B by these persons will be
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