Question
The ratio of the speed of a boat in still water to its
speed in downstream is 6:8. If the difference between the time taken by the boat to travel 288 km each in upstream and in downstream is 3 hours, then find the speed of the boat in still water.Solution
ATQ, Let the speed of the boat in still water and its speed in downstream be '6y' km/h and '8y' km/h. So, speed of the stream = 8y - 6y = '2y' km/h And, speed of the boat in upstream = 6y - 2y = '4y' km/h According to the question, 
Hence, speed of boat in still water is 6y = 12×6 = 72
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
What value should come in place of question mark (?) in the following question. (You need not to calcualte the exact value)
?/647 = 226/ ?
(31.9)3 + (34.021)² - (16.11)3 - (42.98)² = ?
123% of 3825 +2745 =11800 - ?
...
115.98 + 109.01 + (√575 - 17) X 20.09 - 204.89 + 38.03 = ?
(168.24 ÷ 23.98) x 19.81 + ? = 176.33
? * 8.21 = (520.12 ÷ 12.98) % of 6800 - 1350.75
Monthly income of A is Rs. 66000 out of which he spent 18%, 11% and 21% of his total income in rent, medicine and transportation, respectively. Find his...
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exactvalue.)
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