Question
If the sum of upstream and downstream speed is 30 km/hr
and the speed of the current is 5 km/hr. Then find time taken to cover 40 km in downward?Solution
Let the speed of boat in still water be x km/hr. According to the question, => x + 5 + x − 5 = 30 => x = 15 Downstream speed = 5 + 15 = 20 km/hr Required time = 40/20 = 2 hrs
What will be the ratio of simple interest earned on certain amount at the same rate of interest for 8 years and that for 10 years?
A sum of money becomes Rs. 6500 in 3 years at 10% simple interest per annum. Find the principal and the interest earned.
Akshay invested Rs. 2100 in two schemes P and Q in the respective ratio of 9:5. Scheme P and Q are offering simple interest at the rate of 8% per annum ...
- Anjali invested Rs. 9,150 at a simple interest rate of 4% p.a. for 5 years. If she receives Rs. '2n' in total, what is the product of all digits in 'n'?
Simple interest on a sum of money for 2 years is 1/5th of the sum, then the interest received in 5 years on same principal will be what time of the prin...
What sum of money must be given at simple interest for 8 months at 3% per annum in order to earn Rs. 260 interest?
A man invested certain sum at 8% p.a. simple interest for his son who was 16 years old. If the amount received by the son when he was 25 years old is Rs...
Atul has Rs.400 with him. He invested 40% of the amount at 4% p.a. for 5 years and rest at 15% p.a. for 3 years. Find the sum of simple interests receiv...
- Rs. 4,500 is invested in a bond at a simple interest of 20% per annum for 6 years. The resulting amount is then invested in a scheme that offers compound i...
B invested Rs. 8000 in a compound interest scheme for 2 years at an annual interest rate of x%. If he received Rs. 3520 as interest, find the rate of in...
Relevant for Exams:
