Question
The speed of a boat going upstream is 20% slower than
when it is traveling downstream. The boat travels 90 km in still water over a period of 4 hours. Calculate the time required for the boat to cover distances of 120 km upstream and 125 km downstream.Solution
Speed of the boat in still water = 90/4 = 22.5 km/h Let the speed of the stream = x km/h So according to question: 0.80 × (22.5 + x) = 22.5 – x 18 + 0.8x = 22.5 – x 1.8x = 4.5, x = 2.5 Upstream speed of the boat = 22.5 – 2.5 = 20 km/h Downstream speed of the boat = 22.5 + 2.5 = 25 km/h Time taken by the boat to cover 120 km upstream and 125 km downstream = 120/20 + 125/25 = 6 + 5 = 11 hours
What is the respective ratio of number of women visiting Jim Corbett National Park to those visiting Kanha National Park?
Number of men visiting Betla National Park is approximately what percent of the total number of people visiting all the Parks together?
What is the difference between the total number of tourists from Canada and South India together from for Kerala and the total number of tourists who ar...
What is the average number of cars produced by Company Q from 2018 to 2022?
By Club factory, if the total number of ordered placed was 15% more than Myntra, then what was the ratio of the order placed by Jabong to order delivere...
What was the approximate percentage increase in the number of failed students in college D as compared to previous year in Same college 2016?
If the company plans to increase the production of Product B by 20% in the next month while keeping the cost price the same, what will be the new total ...
If the company decides to offer a 10% discount on the selling price of Product A for a special promotion, calculate the new selling price for Product A....
What is the ratio of the number of order placed who were not delivered by Myntra and Flipkart together to that who were ordered by Amazon and Snap deal...
Relevant for Exams:
