A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
Running at the same constant rate, 6 identical machines can produce a total of 270bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes?
If a-b=3 and a2+b2=29, what is the value of ab?
A starts business with TK. 3500 and after 5 months, B joins with A as his partner. After a year, the profit is divided in the ratio 2:3. What is B's contribution in the capital?
What is the smallest number that should be added to 4456 so that the sum is completely divisible by 6?
A fruit seller had some apples. He sold 40% of he apples and still has 420 apples left. How many apples did he have initially?
The population of a town increased from 1,75,000 to 2,62,500 in a decade. The average percentage increase of the population per year is----
A tank is filled in 5 hours by three pipes A, B and C . The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?
The sum of ages of 5 children born at intervals of 3 years each is 50 years. What is the age of the youngest child?
Six bells commence tolling together and toll at intervals of 2,4,6,8,10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?
If one-third of one -fourth of a number is 15, then three-tenth of that number is--
A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
A shopkeeper expects a gain of 22.5% on his cost price. If in a week, his sale was of TK. 392, what was his profit?
An amount of money at simple interest amounts to TK. 815 in 3 years and to TK> 854 in 4 years. The amount is --
The average age of a husband, wife and their child 3 years ago was 27 years and the average age of the wife and the child 5 years ago was 20 years. What is the percent age of the husband?