Question 121581
The car traveled for 1/2 hour at 49 mph, so it must have gone {{{49/2=24.5}}} miles.  Since the car left at 8AM, and reached the snowplow 30 minutes later, it must have arrived at the snowplow at 8:30AM.  The snowplow covered the same distance, 24.5 miles, but started at 5AM.  In other words, the snowplow travelled 24.5 miles in 3.5 hours (8:30 - 5).  {{{24.5/3.5 = 7}}}mph.