The first thing we must do in this case is to define variables. We have then: x: speed of the giraffe x + 5: speed of the ostrich
By definition we have: d = v · t d / v = t Where, d: distance v: speed t: time Since the time is the same then we have:
5 / (x + 5) = 4 / x 5x = 4 (x + 5) Clearing x we have: 5x-4x = 20 x = 20 mph (speed of the giraffe) x + 5 = 20 + 5 = 25 mph (speed of the ostrich) Answer: 20 mph (speed of the giraffe) 25 mph (speed of the ostrich)