Speed of train = 72 × 5/18 = 20 m/s Length of train = 20 × 8 = 160 metres Desired time = (200 + 160)/(1.20 × 20) = 15 seconds
A boy lost his 25% of his money. After spending 30% of the remainder, he has Rs 1260 left. What money does he had initially?
A racing car going at an average speed of 108 km/hr takes 15 minutes to complete a lap on a racing track. By how much should it increase its speed (in ...
Seven years ago, the ratio of the ages of A and B was 4: 5. Eight years hence, the ratio of the ages of A and B will be 9:10. What is the sum of their p...
The boys and girls in a college are in the ratio 3:2. If 15% of the boys and 25% of the girls are adults, then adults are approximately how much % less ...
Among the 720 employees in the office, 30% engage exclusively in playing cricket, and 40% participate in both cricket and chess. If 20% of the employees...
The marks obtained by A is 25% more than B, and the marks obtained by C is 155 more than the difference of the marks obtained by A and B. If C obtained ...
A gave 40% of amount to B. B gave 15% of amount received from A to C. If amount received by C from B is Rs.120, then find the amount received by B from A.
The only expenses of Arun are on grocery, rent and fun expenses. Arun spent Rs. 4,250 on fun, amount spent by him on rent is Rs. 9,000 more than that on...
Z spends 60% of his salary and saves the remaining. After his salary is increased by 30%, he saves 55% of the increased amount besides the amount he use...
The price of a car increased by 5% while its sales decreased by 16%. What is the percentage change in the total revenue?
