Question
The downstream speed of a boat is
22 km/hr, and its upstream speed is 14 km/hr. Determine the time required for the boat to travel a distance of 162 km in still water.Solution
ATQ,
Let speed of boat in still water = ‘x’ km/hr And, speed of stream = ‘y’ km/hr ATQ, (x + y) = 22 ------- (I) And (x – y) = 14 -------- (II) By adding equation (I) and equation (II), we get 2x = 22 + 14 = 36 So, x = 18 so, speed of the boat in still water = 18 km/hr Required time = (162/18) = 9 hours
85.22 of 499.98% + 299.99 ÷ 30.18 = ?
783 ÷ 42.59 × 25.86 =?
118.95 – 24.10 + (91.90 ÷ 22.89 × 12.14) = ?
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.)<...
(31.9)3 + (34.021)² - (16.11)3 - (42.98)² = ?
? = 16.08 + 13.99 × 25.07
(23.99)2 – (17.99)2 + (1378.88 + 44.88) ÷ ? = 607.998
25.31% of 5199.90 + (19.9 × 17.11) + 46.021 =? + 168.98
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.)...
?% of (144.31 ÷ 17.97 × 60.011) = 239.98
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