Well, we know that distance equals speed x time. If the giraffe can run 46.93 feet per second, then by using our equations, we can deduce that the giraffe can run 84.474 feet within 1.8 seconds.
Use I=PRT/100 to solve the question
Yes, this series converges. We can check using the integral test; we have

and

Probability of coin flip = 1/2, probability of die roll = 4/6
1/2 * 4/6 = 1/3 chance