Question
Boat ‘A’ can cover 150 km in still water in 15
hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 5:1 and the speed of stream is 3 km/hr then find the time taken by boat ‘B’ to cover the 60 km in downstream.Solution
Speed of boat ‘A’ in still water = 150/15 = 10 km/hr Speed of boat ‘B’ in still water = 10 × (1/5) = 2 km/hr Downstream speed of boat ‘B’ = 2 + 3 = 5 km/hr Time taken by boat ‘B’ to cover 60 km in downstream = 60/5 = 12 hours
A sum of Rs. 30,000 is invested in SIP 'C' which offers 12% p.a. simple interest for 3 years. The interest received from SIP 'C' is invested in SIP 'D' ...
Vaishali invested Rs. (X + 3000) on compound interest of r% p.a. compounded annually for 2 years and Tanushi invested Rs. (X – 2000) on simple interes...
If the difference between C.I. and S.I. is Rs. 512 at 20% rate of interest in 3 years, then find the principal on C.I.?
‘P’, ‘Q’ and ‘R’, each of them invested Rs. 2000 at the rate of 16% p.a., 24% p.a. and 36% p.a., respectively for 8 years, 3 years and 6 yea...
A sum doubles in 8 years at compound interest. In how many years will it become 4 times?
What will be the compound interest earned after 2 years on a deposit of Rs. 14,000 at an annual interest rate of 30%, compounded annually?
Rs. 5,000 is invested for 3 years in scheme ‘X’ offering simple interest at 8% per annum. The interest earned is equal to the interest obtained when...
- Sneha lends Rs. 10,400 on simple interest at 9% annually for 2 years. If she receives Rs. '2k' at the end, calculate the product of digits of 'k'.
Atul has Rs.350 with him. He invested 20% of the amount at 5% p.a. for 8 years and rest at 10% p.a. for 5 years. Find the sum of simple interests receiv...
On a principal of Rs. 2000, simple interest at R% per annum for 3 years is Rs. 480. Find the simple interest on Rs. 2500 at (R + 4)% per annum for 5 years.
Relevant for Exams:
