Question
A train of length 360 metres crosses a man standing on
a platform in 12 seconds. If its speed decreases by 25%, then find the time taken by the train to cross a platform of length 540 metres.Solution
Speed of train = (360 ÷ 12) = 30 m/s New speed of train = 0.75 × 30 = 22.5 m/s Required time = (360 + 540) ÷ 22.5
= 900 ÷ 22.5
= 40 seconds
Using all the letters of the word IMPACT, how many words start with a vowel but end with a consonant?
Salman has a list of 12 friends. He wishes to invite some of them in such a manner that he can enjoy maximum number of parties, but in each party the nu...
An examinee is required to answer 7 questions out of 14 questions, which are divided into two groups each containing 7 questions. He is not permitted to...
In a group of 9 boys and 5 girls, 5 students have to be selected. In how many ways it can be done so that only 2 boys are included.
How many 5-digit even numbers can be formed using the digits 0 to 9 if no digit is repeated?
- There are 3 identical toys and 4 identical books. How many distinct arrangements are possible on a shelf such that all three toys do not appear together?
In how many different ways can 6 boys and 3 girls to be seated in a row such that all the boys seated together and all the girls seated together?
A man has 15 friends out of which 7 are his relatives. In how many ways can he invite his 9 friends in which at least 5 must be his relatives?
In how ways can the selection be made so that a particular member is always included?
...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?
Relevant for Exams:
