When 5x= 3 and y6= 2 then 3+yx+5 = ?
x years ago, Apu was one-fifth as old as Tipu was then. Tipu will be twice as old as Apu. What is the ratio of Apu's current age to Tipu's current age?
A 250-meter-long train passes a person in 10 seconds, and the person was running at 5 km/h in the opposite direction of the train. What is the speed of the train in km/h?