<human>:  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?
<bot>: How many hours does the first half of the trip last? ** Half of the trip lasts for 8 * 0.5 = <<8*0.5=4>>4 hours.
How many kilometers did Martin travel during the first half of the trip? ** During the first half, Martin did 4 * 70 = <<4*70=280>>280 kilometers.
How many kilometers did Martin travel during the second half of the trip? ** And during the second half 4 * 85 = <<4*85=340>>340 kilometers.
How many kilometers did Martin travel during the journey? ** In total Martin traveled 280 + 340 = <<280+340=620>>620 kilometers during his business trip.
#### 620