Question
A boat can travel 36 km downstream in 2 hours and 24 km
upstream in 3 hours. Find the speed of the boat in still water and the speed of the stream.Solution
Downstream speed = 36/2 = 18 km/h Upstream speed = 24/3 = 8 km/h Let speed of boat in still water = u, speed of stream = v. u + v = 18 u − v = 8 Add: 2u = 26 ⇒ u = 13 km/h Then v = 18 − 13 = 5 km/h Answer: Boat speed in still water = 13 km/h, stream speed = 5 km/h.
? = 19.89% of (29.89 × 12.44) + 9.96 × 12.022
At a village trade fair a man buys a horse and a camel together for Rs 51,250. He sold the horse at a profit of 25 % and the camel at a loss of 20 %. If...
'A' and 'B' invested in a business together. 'A', being the working partner, received Rs. 4,500 as commission. He then took 60% of the remaining profit,...
√ ({(5.5 × 2.3) × √ (728.91))} = 3(1/7) ÷ ?/28
...- √81.45 + √225.60 + 49.89% of (520.43 + 22.13% of 131.45) = ?
√92.10 + √256.30 + 60.78% of (420.90 + 19.36% of 140.25) = ?
(27.08)2 – (14.89)2 – (22.17)2 = ?
49.99% of 539.99 + 263.98% of 49.99 = ?% of 1608.01
Which of the following options is the closest approximate value which will come in place of question mark (?) in the following equation?
48.9 × ...
(9/10 of 3999.79) - √2499.83 + (17.81% of 1199.81) = ?
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