What is the length of the platform?
Aptitude Solved Problems What is the length of the platform? 1. A man purchased a bicycle for Rs. 4800 and sold it immediately at Rs. 5995, allowing the buyer a credit of one and a half years. If the rate of interest is 6%, then find the man gains? Answer: Rs. 700 Explanation: Amount = Rs. 4800 Selling price ( Present Worth of Rs. 5995 due 1.5 years ) = ( Amount * 100 ) / ( 100 + ( Rate * Time )) = ( 5995 * 100 ) / ( 100 + ( 6 * 1.5 )) = ( 5995 * 100 ) / ( 100 + 9 ) = ( 5995 * 100 ) / 109 = 55 * 100 = 5500 Gain = Selling Price - Cost price = 5500 - 4800 = Rs. 700 ∴ Gain of the man is Rs. 700. 2. Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes and 10 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C discharge chemical solutions P, Q and R respectively. What is the proportion of solution R in the liquid in the tank after 3 minutes? Answer: 6 : 11 Explanation: Part filled by ( A + B + C ) ...