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According to question, => (2000/t) – (2000/(t+1/2)) = 200 => (10/t) – (10/(t+1/2)) = 1 => (1/t) – (1/(t+1/2)) = 1/10 => 10 = 2t2 + t => 2t2 + t – 10 = 0 => 2t2 + 5t – 4t – 10 = 0 => t(2t + 5) – 2(2t + 5) = 0 => (2t + 5) (t – 2) = 0 => t = -5/2, 2 (time is not possible in negative) Required time = 2 hours
The sum of the perimeter of circle R and S together is 1012 cm. If the area of circle S is 18634 cm2 , then the radius of circle R is approxi...
A girl spent 20% of her monthly income on clothing. Of the remaining, she spent on travel and food in the ratio of 3:2. If the difference of the income ...
The area of the floor of a cubical room is 49m². The length of the longest rod that can be kept in the room is
If the volume of a sphere is 500 cm³, then find the surface area of the sphere. [Take π = 3]
A cone has a height of 28 cm. A sphere is melted to form this cone. If the radius of the sphere is 7 cm, find the radius of the base of the cone.
If a wheel covers a distance of 1760 m in 80 rotations, then the diameter of the wheel is?
If 'Head' appears consecutively in the first three tosses of a fair/unbiased coin, what is the probability of 'Head' appearing in the fourth toss also?
B invests 30% of his monthly salary on Travelling and 20% of remaining on Food. Again, he invested 25% of the remaining (after travelling and food expen...
