Question
A boat can travel 4.2km upstream in 14min. If the ratio
of the speed of the boat in still water to the speed of the stream is 7:1. How much time will the boat take to cover 17.6km downstream ?Solution
Speed = 7x : x
Downstream = 8x; upstream = 6x
Upstream speed = 4.2 x (60/14) = 18kmph
6x = 18
x = 3
Downstream = 8 x 3 = 24
Time taken for 17.6 km = 17.6 x (60/24) = 44 min
More Boats and streams Questions
À two-digit number decreases by 18 when its both digits are written in reverse order. If unit digit of original number is equal to the unit digit of 22...
What is the highest possible sum of (p + q) if the number '4p679q3' is divisible by 12?
- Let ‘n’ be the smallest perfect square divisible by 22, 26, 33 and 39. What is the remainder when ‘n’ is divided by 100?
Bhawna won 3/5 of the marbles that were there at the beginning of the game. Ravi won 2/3 of the remaining marbles while Sunny won the remaining 80 marbl...
- Two numbers add up to 98. If the LCM of the numbers is 315 and the HCF is 9, find the smaller of the two numbers.
The mean of 12 numbers is 15. When two additional numbers, x and y , are included, the average increases by 1. Given that the difference between x and y...
- The least number 'Y' which when divided by 15, 20, and 45 leaves 2 as the remainder in each case. Find the value of ('3Y' - 5).
- Instead of multiplying a number by 0.9, a student accidentally used 9. His result turned out to be 3510 more than the actual result. What is the original n...
- For what number of values of 'z' is the number 1269zq divisible by 15?
- The product of two numbers is 15.75. If one of the numbers is 4.5, then find the other number.
Relevant for Exams:
