Question
Speed of a boat in still water to speed of boat in
upstream is 7:4. If the boat can travel 450 km in downstream in 5 hours, then find the time taken by the boat to cover 21 km in still water.Solution
Let speed of boat in still water and speed of boat in upstream be ‘7x’ km/h and ‘4x’ km/h, respectively. Speed of stream = 7x – 4x = 3x km/h Speed of boat in downstream = 7x + 3x = 10x km/h So, 10x = 450/5 = 90 Or, x = 9 Speed of boat in still water = 7 × 9 = 63 km/h Desired time = 21/63 = 20 minutes
P, Q, and R started a business where the investment ratio between P and Q is 1:2, and the investment ratio between Q and R is 5:3...
P and Q started a business by investing Rs.5600 and Rs.4000 respectively. After 6 months, Q increased his investment by a certain percentage such that a...
- Person 'A' invests Rs. 'y' in a business, while person 'B' contributes Rs. (y + 400). After a duration of 2 years, A's profit is 1/6 less than B's profit. ...
A, B and C started a business together with Rs 12,000, Rs 12,000 and Rs 8,000 respectively. B worked only for ‘x’ months while C left the business ...
Pawan and Qureshi started a business where Qureshi’s investment was 62.5% of Pawan’s investment. After 5 months, Pawan withdr...
A and B jointly invested in a business with initial contributions of Rs. 'x' and Rs. 'y', respectively. After one year, A's share of the total profit of...
- Ravi and Suman invested Rs. 6000 and Rs. 9000 respectively in a business. Ravi kept his investment for 10 months, while Suman kept it for 8 months. If Ravi...
'Anuj' and 'Pawan' started a business by investing Rs. 40,000 and Rs. 60,000, respectively. Six months later, 'Charu' also joined the business by inves...
A, B and C hired a taxi for Rs. 810 and used it for 2, 3, 4 hours respectively. Hiring charges paid by B are:
A, B and C started a online education website by investing Rs.36,000, Rs.40,000 and Rs.50,000 respectively. Find the share of A’s, out of an annual pr...
Relevant for Exams:
