A train is moving at a speed of 80 km/ h and covers a certain distance in 4.5 hours. The speed of the train to cover the same distance in 4 hours is 

The ratio of two positive numbers is 3 : 4. The sum of their squares is 400. What is the sum of the numbers?

The students of a class donated Rs. 3, 481 towards relief fund. Each student donated an amount qual to the number of students in the class. The number of students in the class is: 

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

Vivek is 30% more efficient than Neha. How much time will they, working together, take to complete a job which Vivek alone could have done in 23 days?

Simple interest on an amount is Rs. 24 and true discount on the same is Rs. 20. The principal amount is

Answer the following questions

Nirmal started a business by investing Rs.48000. After 7 months, Vidya joined him with a capital of Rs.56000. At the end of the year of the total profit was Rs.5885. What is the Vidya’s share of the profit?

A person spends 40% of his monthly income. The monthly income of the person is increased by 15% and his expenditure is decreased by 22%. What is the approximate percentage increase in his savings?