Question

Isaac drove at an average speed of 54 mph over six hours. During the first three hours he drove at a speed that was 187 mph less than four times the speed he averaged for the last three hours. How fast did he drive during the first three hours?

Answer 1

since distance = speed * time,
If his speed for the last three hours was x, then
3(4x-187) + 3x = 54*6