A walking person was able to cover a distance of 3 kilometers in 15 minutes. What is the speed of the person? 

Ana went to a party, which is 120 kilometers from her home. On her way home, she drove 10km/hr slower because of a road construction which took her 2 hours longer. How fast did she drive on her way home from the party?

What is the complement of $70°$

Ana went to a party, which is 120 kilometers from her home. On her way home, she drove 10km/hr slower because of a road construction which took her 2 hours longer. How fast did she drive on her way to the party?

The sum of a positive number and its square is equal to 6. What is the number?

What is the complement of $40°$ ?

How many liters of 40% alcohol solution should be added to 30 liters of a 50% alcohol solution to make a 45% solution?

How many liters of 30% alcohol solution should be added to 20 liters of a 50% alcohol solution to make a 40% solution?

 A train covers a distance of 90 kilometers. If its speed becomes 15 kph more it would take 30 minutes less for the whole trip. What is the ideal speed of the train? 

A bus and a car covered a distance of 60 kilometers. The speed of the bus is 10 km faster than the car and arrived 2 hours earlier. What is the speed of the car?