Question
A boat takes 7 hours to cover 259 km upstream and 9
hours to cover 477 km downstream. Find the time taken by the boat to cover 602 km upstream and 605 km downstream if speed of boat in still water is increased by 4 km/h and speed of stream is decreased by 2 km/h.Solution
Upstream speed = 259/7 = 37 km/h Downstream speed = 477/9 = 53 km/h Speed of boat in still water = (37 + 53)/2 = 45 km/h Speed of stream = (53 – 37)/2 = 8 km/h Increased speed of boat in still water = 45 + 4 = 49 km/h Decreased speed of stream = 8 – 2 = 6 km/h Required time taken = 602/(49 – 6) + 605/(49 + 6) = 14 + 11 = 25 hours
In the word ‘ INCREASE’ all consonants are written as their preceding letter and all vowels are written as their following letters. Now all letters ...
नौ दिन पहले मोहिनी सिनेमा देखने गई। वह केवल बृहस्पतिवार क...
What should be the third step of the following input?
Input: 91 273 35 249 553 511 201 183
Select the option that is related to the third number in the same way as the second number is related to first number and the sixth number is related t...
- The ratio between cost price, labelled price and the selling price of a product is 4:10:6. If a profit of Rs. 240 is gained on the sale, find out how much ...
Rama is taller than Geetha. Vimala is taller than Rama but shorter than Meenu. Bindu is taller than Geetha but shorter than Rama. Who among the given pe...
Study the given pattern carefully and select the number that can replace the question mark (?) in it.
First row: 14, 22, 31
Second row:...
How many such pairs are there in the word ‘ KLING ’ each of which has many letters between them in the word as they have between them in the English...
If ‘lived is coded as ‘ma’ then what is the code for ‘to’?
3 बजकर 30 मिनट पर घड़ी की मिनट एवं घण्टे की सूई कितने डिग्री का...
Relevant for Exams:
