Traveling at an average rateaverage rate of between 50 and 60 miles per hour for 4 to 7 hours select the best estimate for the distance traveled.

150miles

315 miles

340miles

415miles

best close estimate distance is 315 miles

Explanation:

given data

speed v1 = 50 miles per hour

speed v2 = 60 miles per hour

time t1 = 4 hr

time t2 = 7 hr

to find out

best estimate for the distance traveled

solution

we know lower end distance

distance = v1 * t1

distance = 50 * 4 = 200 miles

and

upper end distance

distance = v2 * t2

distance = 60 * 7 = 420 miles

so middle value distance is

v = 55 miles per hour and t = 5.5 hours

distance = v * t

distance = 55 * 5.5

distance = 302.5 miles

so best close estimate distance is 315 miles