unable to understand solution X and Y start simultaneously from P and Q and walk towards Q and P respectively. P and Q are 900 m apart. On reaching their respective destinations, they turn around and move towards their respective starting points. They continue to travel this way indefinitely. The second time the two are at the same point at the same time is at the point R, 300 m from Q. Which of the following can be the ratio of X’s speed to Y’s speed?a. 4b. 2/5c. 4/5d. all of the above

unable to understand solution X and Y start simultaneously from P and Q and walk towards Q and P respectively. P and Q are 900 m apart. On reaching their respective destinations, they turn around and move towards their respective starting points. They continue to travel this way indefinitely. The second time the two are at the same point at the same time is at the point R, 300 m from Q. Which of the following can be the ratio of X’s speed to Y’s speed?a. 4b. 2/5c. 4/5d. all of the above

unable to understand solution f(x) = 4x+4, when x is in the form of 2n+1and f(x) = 4x+3, when x is in the form of 2nWhere f(x) is defined for all positive integers. Find the remainder when f(1)+f(2)+f(3).........f(251) is divided by 2.

unable to understand solution f(x) = 4x+4, when x is in the form of 2n+1and f(x) = 4x+3, when x is in the form of 2nWhere f(x) is defined for all positive integers. Find the remainder when f(1)+f(2)+f(3).........f(251) is divided by 2.

unable to understand solution A mixture P is formed by removing a certain amount of coffee from a coffee jar and replacing the same amount with cocoa powder. The same amount is again removed from mixture P and replaced with same amount of cocoa powder to form a new mixture Q. If the ratio of coffee and cocoa in the mixture Q is 16 : 9, then the ratio of cocoa in mixture P to that in mixture Q is.