Reena, Ritu and Sita can independently complete a piece of work in 6 hours, 9 hours and 18 hours respectively. If they work together, then how much time (in hours) will they take to complete that piece of work?
A school has two sections of a class, Section A has 30 students and Section B has 20 students. The average score of the students in Section A is 85, and the avergae score of the students in Section B is 70.What is the overall average score of the class?
The strenght of a school increases and decreases every alternate year by 20%. It started with an increase in the year 2015 and the initial strenght was 3000. Find the strenght of the school in the year 2017 and alos the % of increase in strength, respectively.
The bar chart shows the favourite colour of 380 students in a class. Study the bar chart and answer the questions based on it.
The total number of students whose favourite colour are Blue, Magenta, Red and Yellow is what % (rounded off to the nearest integer) of the total number of students in the class?
The total journey is of 800km. A car travels the first 320km of the journey at the speed of 64kmph. What should be the speed of the next 480km so that the avergae speed will become 80kmph?
A man takes 8 hours 30 minutes to go to a place by bicycle and return from there by scooter.
If he travels both ways by bicycle, it takes him 10 hours. How much time will he take to travel both ways by scooter? (in hours?)
A policeman spots a thief at a distance of 185 m. The thief starts running, and the policeman chases him. The thief and the policeman run at speeds of 8 m/s and 9 m/s respectively.
What will be the distance between them after 2 minutes?
