A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours. Then the speed of boat in still water and the speed of current are respectively. 

If a=34, b=c=33, then the value of a3+b3+c3-3abc is 

The LCM of two consecutive even numbers is 144, find the numbers?

If the product of three consecutive numbers is 210 then the sum of the smaller numbers is: 

The average mathematics marks of two section A and B of class IX in the annual examination is 74. The average marks of Section A is 77.5 and that of Section B is 70. The ratio of number of student of section A and B is:

The LCM of two numbers is 12 times their HCF. The sum of the HCF and the LCM is 403. If one of the number is 93, then the other number is. 

A man, a woman and a boy can complete a job in 3, 4 and 12 days respectively. How many boys must assist 1 man and 1 woman to complete the job in $$1\over4$$  of a day?

A sum of money placed at compound interest triples itself in 9 year. In how many years will if amount to 243 times itself?