Question
A boat can travel 7.2 km upstream in 18 min. If the
ratio of the speed of the boat in still water to the speed of the stream is 7:1. How much time will the boat take to cover 17.6 km downstream ?Solution
Speed = 7x : 1x
Downstream = 8x; upstream = 6x
Upstream speed = 7.2 x (60/18) = 24 kmph
6x = 24
x = 4
Downstream = 8 x 4 = 32
Time taken for 17.6 km = 17.6 x (60/32) = 33 min
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....
 (3/5) of 3025 + (18² + 12²) = ? + 22.22% of 1125
620.15 + 1279.98 + ? × (4.79)2 = 149.95% of 1600.14
- 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.)
1279.98 ÷ 40.48 × 10.12 = ? × 2.16
783 ÷ 42.59 × 25.86 =?
1 ÷ 6.43 of 191.90+75.03% of 220=?²-202.9
45.1298% of (14.032 - 75.98) + 27.87% of √40001 = 449.98% of 24.098 + ?Â
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.)...
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