Upstream speed = 294/7 = 42 km/h Downstream speed = 486/9 = 54 km/h Speed of boat in still water = (42 + 54)/2 = 48 km/h Speed of stream = (54 – 42)/2 = 6 km/h Increased speed of boat in still water = 48 + 4 = 52 km/h Decreased speed of stream = 6 – 2 = 4 km/h Required time taken = 720/(52 – 4) + 616/(52 + 4) = 15 + 11 = 26 hours
Rs.1581 is divided among A, B and C in the ratio 10 : 15 : 6. What is the share of B?
An alloy contains copper and zinc in the ratio 5 : 3 and another contains copper and tin in the ratio 8 : 5. If equal weights of the two are melted toge...
If x+3, x-2, 6 and 5 are in proportion then find the mean proportional to x and 9x2.
If x runs are second by Rohit, y runs by Shreyas and z runs by Virat, then x : y = y : z = 4 : 3. If total number of runs scored by Rohit, Shreyas and V...
P, Q and R together started a business. Seven times the investment of P equals nine times the investment of Q and the capital of Q is twice that of R. F...
A sum of Rs. 178 needs to be divided among 60 students in a class, where each boy receives Rs. 2.5 and each girl receives Rs. 3.5. Determine the ratio o...
Ratio of males to females in village ‘A’ and village ‘B’ is 9:10 and 7:8, respectively and number of females in village ‘B’ is 25% more than...
A sum of money is divided among P, Q, R and S in the ratio of 5:6:10:11 respectively. If the share of R's is Rs. 2440 more than the share of Q, then wha...
The earnings of two individuals, P and Q, are in the ratio of 4:7. After an increase of 30% in Q’s earnings, his total earnings amount to Rs. 27,300. ...
The ratio between two numbers is 4:5. If each number is increased by 6, the ratio between then become 7:8, find the difference between numbers.
