1. **State the problem:** We have two roller coaster rides with different durations. The first ride, Supreme Ride, lasts 2 1/2 minutes. The second ride, Soul for Dragon, lasts 135 seconds. We need to find which ride is shorter and by how many seconds. 2. **Convert all times to the same unit:** Since the second ride's time is in seconds, convert 2 1/2 minutes to seconds. $$2\ \text{minutes} + \frac{1}{2}\ \text{minute} = 2 + 0.5 = 2.5\ \text{minutes}$$ Since 1 minute = 60 seconds, $$2.5 \times 60 = 150\ \text{seconds}$$ 3. **Compare the two times:** Supreme Ride = 150 seconds Soul for Dragon = 135 seconds Since 135 seconds < 150 seconds, Soul for Dragon is shorter. 4. **Calculate how many seconds shorter:** $$150 - 135 = 15\ \text{seconds}$$ 5. **Final answer:** Soul for Dragon is shorter by 15 seconds.