The value of \(\sqrt{cosec\theta-cot\theta\over cosec\theta+cot\theta}\)\(\div {sin\theta\over1+cos\theta}\) is equal to :

If x cosA - y sinA = 1 and x sinA + y cosA = 4, then the value of \(17x^2+17y^2\) is:

4 men and 5 women can complete a work in 15 days, whereas 9 men and 6 women can do it in 10 days. To complete the same work in 7 days, how many women should assist 4 men?

The time taken by a boat to go a certain distance upstream is twice the time taken by it to go the same distance downstream. If the speed of the stream is 3 km/h, then how much time (in hours) will the boat take to go 52 km upstream?