Question
The speed of a boat in still water is 5 times more than
that of the current. If the boat takes 10 hours to cover 200 km upstream, then find the time taken by the boat to cover 420 km downstream.Solution
Let the speed of the current be ‘x’ km/hr
Therefore, speed of the boat in still water = 6x km/hr
According to the question,
6x – x = 200 / 10
Or, 5x = 20
Or, x = 4 km/hr
Required time taken = 420 / (6x + x) = 420 / (7 × 4) = 420/28 = 15 hours
Ravi shared Rs. (x + 3600) between his two kids, Arjun and Bharat, in the ratio of 5:3. Arjun put his share in a simple interest scheme at 10% p.a. for ...
A and B started a business with initial investments of Rs. 28000 and Rs. 35000 respectively. After one year, a profit of Rs. 10000 is earned. A being a ...
What will be the ratio of simple interest earned on certain amount at the same rate of interest for 5 years and that for 10 years?
Ramesh invested Rs. (x + 200) in Scheme A at a simple interest rate of 20% p.a. for 2 years, and the interest received is Rs. 800. He then invested Rs. ...
A man deposited Rs. 16000 at 10% compound interest, compounded annually while Rs. 14000 at 13% simple interest per annum. What will be the difference be...
A person invested some amount at the rate of 12% simple interest and a certain amount at the rate of 10% simple interest. He received yearly interest of...
A took a loan of Rs.5680 at simple interest of 30% p.a. and invested the same money in a scheme at simple interest of 40% p.a. Find the profit earned by...
Simple interest received at the rate of 12% p.a. for 6 years on a principal amount of Rs. 8000 is twice of the simple interest received at 10% p.a. for ...
Rs. 6,500 is invested in scheme ‘A’ for a year at simple interest of 20% p.a. The interest received from scheme ‘A’ is reinvested for 2 years in...
The difference between the compound interest, compounded annually and simple interest on Rs. ‘P’ at the rate of 25% p.a. for 2 years, is Rs. 150. If...
