A ferry, when empty , travels twice as fast as when it is full. It travels 20 miles south with a cargo, spends 30 minutes for unloading , and returns to its original port empty in a total of 8 hours , what is the speed of the ferry when it is empty?

A bicycle has two wheels of 120 cm and 40 cm in diameters. when the large wheel makes 10 revolutions , how man...

Two numbers A and B are such that the sum of 5% A and 4% of B is two - third of the sum o f 6% A and 8% of B....

Baki lives 2 miles west of Raju's house . Rafiq lives 3 miles of Raju's house and 2 miles west o Diba's house....

On Tuesday, 30 of the students in a class took a test and their average score was 83.5 . On Thursday , the oth...

If the average of 7 , 13 , p , and q is 17 , what is the average of ( p +1) and (q -9) ?

A circular logo is enlarged to fit the lid of a jar. The new diameter is 50 percent larger than the original ....