Question
Ratio of speed of boat in downstream and speed of stream
is 7:3, if speed of current is 9 km/hr, then find distance travelled (in km) upstream in 6 hours.Solution
Given ratio: Downstream speed : Stream speed = 7:3 Stream speed = 9 km/hr Find downstream speed: Let Downstream speed = 7x and Stream speed = 3x Since 3x = 9 → x = 3 So, Downstream speed = 7×3=21 km/hr Find boat’s actual speed: Boat speed in still water = Downstream speed - Stream speed = 21 - 9 = 12 km/hr Find upstream speed: Upstream speed = Boat speed - Stream speed = 12 - 9 = 3 km/hr Find distance traveled upstream in 6 hours: Distance = Speed × Time = 3 × 6 = 18 km
- Nisha placed Rs. 25,000 in plan 'P' and Rs. 40,000 in plan 'Q'. Plan 'P' earns 14% simple interest annually for 2 years, and plan 'Q' earns 9% per annum fo...
Anil borrowed Rs.10000 on CI at the rate of 20% for three years. He paid at the end of first year (1/8)th of amount and end of second year (1/6)th of am...
Pawan invested Rs. 1200 for 4 months, Qureshi invested Rs. 1600 for 6 months, and Raju invested Rs. 2000 for 12 months in a busin...
Calculate the compound interest earned on investing Rs. 20,000 at 25% per annum compounded annually for 2 years.
A sum of ₹12,000 is invested at a rate of 5% per annum for 3 years. What will be the total amount at the end of the investment period, including inter...
The simple interest received on a certain sum is Rs. 400 less than the sum invested. If the sum was invested at 15% p.a. for 5 years, then find the simp...
An amount of Rs. ‘P’ was invested at an interest rate of ‘R%’ per annum, compounded annually. After 2 years, the compound interest earned was Rs...
A man deposited Rs. ‘x + 700’ at 12% per annum simple interest and earned Rs. 624 as interest after 2 years. Find the interest earned by him if he d...
Find the simple interest and amount on Rs 9,000 at 7% per annum for 3 years.
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:
