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?
Half of the trip lasts for 8 * 0.5 = <T>multiply(8, 0.5)=4.0 hours.
During the first half, Martin did 4 * 70 = <T>multiply(4, 70)=280 kilometers.
And during the second half 4 * 85 = <T>multiply(4, 85)=340 kilometers.
In total Martin traveled 280 + 340 = <T>add(280, 340)=620 kilometers during his business trip.
