Question
A was travelling from point X to point Y. He increased
his speed by 14 km/h after every hour. He reached his destination in 18 hours. If his initial speed was 20 km/h, then what was his average speed in the whole journey?Solution
Total distance travelled by A = (18/2) × {2 × 20 + (18 – 1) × 14} = 14 × (40 + 238) = 2502 km Required average speed = 2502/18 = 139 km/h
Mr. Ghanshyam deposited certain amount in the Bank at the end of each year. How much amount did he deposit at the end of each year at the rate of 15% si...
If ₹5,000 is invested at an annual interest rate of 8% compounded quarterly, at what time will it grow to ₹5,202?
Compound interest on a certain sum of money for 2 years is Rs.5160 while the simple interest on the same sum for the same time period is Rs.4800. Find t...
- An investor put Rs. x into Fund X and Rs. x/2 into Fund Y. Fund X offers 4% p.a. and Fund Y offers 10% p.a. simple interest. If after 3 years the total int...
Santosh invested Rs.9000 in a scheme for 6 years which is offering 15% simple interest. The amount received after 6 years from scheme B has been investe...
The simple interest received on a certain sum is Rs. 480 less than the sum invested. If the sum was invested at 12% p.a. for 7 years, then find the simp...
A man invested Rs.Y in a scheme S at 14% rate of simple interest for 7 years. After 7 years, he reinvested the amount received from the scheme S at same...
Anita and Rohan each invested a sum of ₹12,000 for 2.5 years at 20% compound interest per annum. However, while for Anita the interest was compounded ...
A certain sum when invested at compound interest of 12% p.a. amounts to Rs. 6272 in 2 years. Find the amount received when the same sum is invested at 2...
A person lends ₹16,000 to a client at a simple interest rate of 8% per annum. After 30 months, the client repays ₹9,200 and requests an extension fo...
