Question
A boat covers a distance of 45 km in still water in 2.5
hours. The ratio of its speed while traveling upstream to its speed while traveling downstream is 4:5. What is the speed of the stream?Solution
Speed of the boat in still water = 45 ÷ 2.5 = 18 km/hLet the speed of the stream = 'x' km/hUpstream speed of the boat = (18 - x) km/hDownstream speed of the boat = (18 + x) km/hAccording to the question,(18 - x):(18 + x) = 4:5Or 90 - 5x = 72 + 4xOr, 18 = 9xSo, x = (18/9) = 2
19.89% of 449.67 + 14.67% of 299.89 - 9.89% of 99.79 = ?
`(sqrt(960.87)xx9.932+sqrt(629.998)xx26.385)/(sqrt(1028.902)xx4.977)=?`
Find the approximate value of Question mark(?). There is no requirement to find the exact value.
? = 200.14 + 27.98 × 16.05 − (10.03)² - 12.9...
- 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 approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
1299.999 ÷ 325.018 × 24.996 = ?
What approximate value should replace the question mark?
99.95 − √529 × 3 + 1439.80 ÷ 12.02 = ?
619.97 ÷ 20.01 X 124.99 ÷ 24.91 = ?
124% of 620.99 + 11.65% of 1279.23 = ?
What approximate value should replace the question mark?
9.96% of 1200.10 − 25% of 4800 = ? − 7000.20
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