1) Weight the speed by the time and compute the weighted average. (60*2.5 + 75*1.5)/(2.5 + 1.5) = 65.625 Her average rate of speed is 65.625 mph.
2) Consider distance and time. distance = speed * time distance₁ = speed₁ * time₁ distance₂ = speed₂ * time₂ total distance = distance₁ + distance₂ total time = time₁ + time₂ And the average speed is given by average speed = (total distance)/(total time)
Using the above formulas, we have distance₁ = 60 mi/h * 2.5 h = 150 mi distance₂ = 75 mi/h * 1.5 h = 112.5 mi total distance = 150 mi + 112.5 mi = 262.5 mi
Step-by-step explanation: in the first 4 minutes she planted 7 flowers, in the next 8 minutes she planted 21 flower. so what i did was divide 70 by 7... since the amount of flowers is going up by 7's. so 70 divided by 7 is 10... now every 4 minutes you plant flowers so 10 by 4= 40 minutes