A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

On his way home from shopping. Mobarok must travel due south for 5 miles and then due east for another 12 miles to reach his house. If Mobarok could travel in a straight line from the store to his house, how many fewer miles would he travel?

P and Q can complete work in 15 days and 10 days respectively. They started the work. together and then left after 2 days. P alone complete the remaining work. How many days in total it took to finish the work?

A train 240 m long passes a pole in 24 seconds. How long will it i platform 650 m long?

The cost of equities of type A and Bi ( in dollar) are two different positive integers. If 4 equities of type A and 5 equitives of type B together cost 27 dollars,what is the total cost of 2 equities of type A and 3 equities of Type B in dollars?

The percentage profit earned by selling an article for Tk. 1,920 is equal to the percentage loss incurred by selling the same article for Tk. 1,280. At what price should the article be sold to make 25% profit?