Question
A sum of money doubles itself in 8 years in how many
years it will be 5 times?Solution
Sum of money doubles, means interest is same as principal amount, Let Principal = P So, SI = P Amount = P + SI = P + P = 2P => A = P + (PRT/100) => 2P = P + (P×R×8)/100) => 200 = 100 + R × 8 => 100 = R × 8 => R = 12.5% According to the question, => 5P = P + (P×12.5×T)/100) => T = 32 years
Find the total distance covered by boat in each upstream and downstream in 5 hours if the speed of boat in still water and speed of current is 20 km/h a...
- A motorboat covers 96 km downstream in 4 hours. Coming back upstream over the same distance, it takes 8 hours longer than the downstream time. Find the spe...
If the sum of upstream and downstream speed is 30 km/hr and the speed of the current is 6 km/hr. Then find time taken to cover 84 km in downward?
Speed of boat is 25 km/hr. Speed of the stream is 20% less than speed of boat. Then find time taken by boat to go 90 km downstream?
The speed of a boat in still water is 6 km/hr more than that of the current. The time taken by the boat to cover 875 km downstream is 17.5 hours. Find t...
A man can row his boat with the stream at 22 km/h and against the stream in 7 km/hours. The man’s rate isÂ
Speed of a boat in still water to speed of boat in upstream is 11:7. If the boat can travel 300 km in downstream in 5 hours, then find the time taken by...
A boat running downstream covers a distance of 32 km in 4 hrs and covering the same distance upstream in 16 hrs. What is the speed of a boat in still wa...
A boat travels the same distance 'd' km in both upstream and downstream directions, taking a total of 15 hours for the round trip. If the downstream spe...
A boat’s speed in still water is 1.5 times the speed of the current. It takes the boat 22.5 hours to travel 90 km upstream. If ...