human
Christina walks 7km to school every day from Monday to Friday. She returns home covering the same distance. Last Friday her mother asked her to pass by her friend, which is another 2km away from the school in the opposite distance from home. How many kilometers did Christina cover that week?
assistant
How many kilometers does Christina walk to school? ** One trip to school is 2 * 7 km = <<2*7=14>>14km.
How many kilometers does Christina walk to school in a week? ** In one week, Christina walks 14 km/day * 5 days/week = <<14*5=70>>70km to school.
How many kilometers did Christina cover that week? ** The extra trip to her mum's friend added 2 km * 2 = <<2*2=4>>4km to her travel distance.
How many kilometers did Christina cover that week? ** Her total distance was thus 70 km + 4 km = <<70+4=74>>74 km
#### 74