Martin went on an eight-hour business trip. During the first half of the trip, he traveled at a speed of 70 kilometers per hour and during the second half at a speed of 85 kilometers per hour. How many kilometers did he travel during the journey?
Thoughts? Step-by-step reasoning:
Half of the trip lasts for 8 * 0.5 = 4 hours. During the first half, Martin did 4 * 70 = 280 kilometers. And during the second half 4 * 85 = 340 kilometers. In total Martin traveled 280 + 340 = 620 kilometers during his business trip.
Thus, the answer is 620.