Whitney left school and drove 7 miles to meet her mother at a restaurant. Her mother left at the same time and drove 8 miles, traveling 5 miles faster then her daughter. If the two arrived at the restaurant at the same time, what was whitney's speed
Let's write the cinematic equation for Whitney and her mother. We have then: For Whitney: d = v * t 7 = v * t For her mother: d = (v + 5) * t 8 = (v + 5) * t Where, v: speed t: time We have then how the time is the same: 7 / v = 8 / (v + 5) We cleared v: 7 (v + 5) = 8v 7v + 35 = 8v 8v-7v = 35 v = 35 mph Answer: whitney's speed is: v = 35 mph
