Let the speed of the current be x kmph. According to the question, 9/(9 – x) = 2 ⇒ 18 – 2x = 9 ⇒ 2x = 18 – 9 ⇒ x = 9/2 = 4.5 km/hr
In a Group of 8 boys and 6 girls, Six children are to be selected. In how many different ways can they be selected such that at least one boy should be ...
In how many ways will a team of 5 people be selected among 12 people such that one specific person will always be selected, and one specific person will...
In how many ways can 2 girls and 8 boys be seated in a row so that girls are always together?
In how many different ways can the letters of the word QUANTITY be arranged so that the vowels always come together?
How many five digit numbers can be formed using the digits 0, 1, 2, 3, 4 and 5 which are divisible by 5, without repeating the digits?
There are 10 boys and 15 girls in the commerce class. Three students are selected at random. The probability that two girls and one boy are selected is.
Which of the following is TRUE for “complementary event or ‘not event’”?
Find the number of words that can be formed by using all letters of the word 'TANGLE', if it starts with letter G and end with letter A.
A committee of 4 people is to be formed from a group of 10 individuals. If 2 specific individuals refuse to work together, how many different committees...
How many different words can be formed with the letters of the word PRACTICE such that each of the word begin with E and ends with R?
