A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :
The cost price of 20 articles is the same as the selling price of x articles. If the profit is 25%, then the value of x is:
The sum of ages of 5 children born at the intervals of 3 years each is 50 years. What is the age of the youngest child?
In the first 10 overs of a cricket game, the run rate was only 3.2. What should be the run rate in the remaining 40 overs to reach the target of 282 runs?