Sean competes in a triathlon in which he has to first swim, then bike, and then run for the same distance. He swims at a rate of 2 kilometres per hour, bikes at a rate of 25 kilometres per hour, and runs at a rate of 8 kilometres per hour. What is his average speed over the entire race?
Students from grade 5 class decided to collect money for earthquake relief. The amount (in QR) collected by each students equals to number of students in the class, If they collected a total of QR5329, how many students were there in the class?
Some mangoes are packed into a box in stacks. Each stack has the same number of mangoes in each row as the number of rows. The number of stacks is also the same as the number of rows. If there are 65 stacks of mangoes in the box, what is the total number of mangoes in the box?
Pump A can fill a tank in 14 minutes, while pump B can fill the same tank in 35 minutes. Both pumps are turned on together to fill the empty tank, but when tank became half full, pump B stops working and rest of the tank is filled by pump A only. How long it took to fill the tank?
There are a total of 16 chocolates - 4 each in the flavors of orange, grape, strawberry and banana. There are also 5 children. If each child is allowed to choose their own favorite flavor, what is the probability that all of them will get flavors of their choice?