The total time for the whole journey = 7 hours
Distance = Speed x time
Distance traveled for the first 3 hours
time = 3 hours
speed = 60 km/h
Distance = 60 x 3
Distance = 180 km
180 km was traveled for the first three hours
Total distance traveled = 460 km
Distance traveled at an average speed of 70 km/h = 460 - 180
Distance traveled at an average speed of 70 km/h = 280 km
Speed = Distance / time
70 = 280 / time
time = 280 / 70
time = 4 hours
Mr. Ben traveled 3 hours at an average speed of 60 km/h, he traveled 4 hours at an average speed of 70 km/h.
The total time for the whole journey = 3 hours + 4 hours
The total time for the whole journey = 7 hours
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