Question
A boat can travel 30 km downstream in 45 min. The ratio
of the speed of the boat in still water to the speed of the stream is 5: 3. How much time will the boat take to cover 25 km upstream?Solution
Speed of downstream = D/T = 30 × (60/45) = 40 km/hr The ratio of the speed of the boat in still water to the speed of the stream = 5: 3 (5x, 3x) => 8x = 40 => x = 5 Speed of upstream = 5x – 3x = 2x = 10 km/hr Distance = 25 km Time = D/S = 25/10 = 2(1/2) hr = 2-hour 30 min
244.98% of 189.98% of 599.99 + 199.98 = ?
3.55% of 8120 – 66.66% of 540 = ? – 28% of 5500
124% of 620.99 + 11.65% of 1279.23 = ?
The profit earned when an article is sold for Rs. 2,000 is the same as the loss incurred on selling it for Rs. 1,200. Find the selling price of the arti...
47.78% of 499.98 + (19.89 × 7.76) = √? × 49.84
? = 650.24 + 1124.97 – 14.992
?% of (136.31 ÷ 16.97 × 75.011) = 179.98
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.)...
(4096)1/3 × 10.11 × 11.97 ÷ 24.32 = ? + 15.022
6401.23 × `1 3/4` - 352.87 × ? = 10443.789
