Five boys start whistling together and whistle at the intervals of 5,10,15,20 and 25 seconds respectively. In 40 minutes, how many times do they whistle together?

A child with type o blood could not have a parent with type ________ blood.

A, B, C and D are four people. 1) A is the son of B. 2) B is the daughter of C. 3) C is the mother of D. Which among the following is true?

Choose the word closest in meaning to BANE.