Question
A man invested Rs. 'B' at simple interest of 18% and Rs.
'B + 4000' at simple interest of 14% p.a., for 4 years each. If the interest earned from both investments is the same, then find the sum invested at the lower rate of interest.Solution
ATQ, Simple interest = Sum X rate of interest X time period of investment ÷ 100 ATQ; 
Or, 7.2B = (B+4000)×5.6 Or, 7.2B = 5.6B+22400 Or, 1.6B = 22400 Or, B = 14000 So, sum invested at lower interest = 14000 + 4000 = Rs. 18,000
The speed of the stream is 15 km/h. Boat ‘A’ covers 140 km distance against the stream in 4 hours and boat ‘B’ covers 105 km distance against th...
A boat takes 3 hours to travel 24 km downstream and 4 hours to travel 16 km upstream. What is the speed of the current?
A boy can swim in water with a speed of 15 km/hr in still water. If the speed of the stream is 8 km/hr, what will be the time taken by the boy to cover ...
The speed of the stream is 12 km/h. Boat ‘A’ covers 120 km distance against the stream in 6 hours and boat ‘B’ covers 120 km distance against th...
A takes 3 hours more while swimming upstream than downstream. His speed in still water is 12 km/hr. The speed of stream is 4 km/hr. What is the distance?
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 925 km downstream is 18.5 hours. Find t...
A boat can cover 180 km in downstream in 18 hours and 125 km in upstream in 5 hours. Find the distance travelled by the boat in still water in 10 hours.
A boat covers 30 km downstream in 60 minutes. If the ratio of the speed of the boat in still water to that of the speed of the stream is 8:4, respective...
A man rows a boat a certain distance downstream in 9 hours, while it takes 18 hours to row the same distance upstream. How many hours will it take him t...
A boat can cover 187 km in downstream in 11 hours and 180 km in upstream in 18 hours. Find the speed of boat in still water
Relevant for Exams:
