Let the original speed be s km/h.
In the first scenario, the car travels for 7 hours at speed s:
Distance =s×7=7s
In the second scenario, the car travels for 6 hours at speed (s+10):
Distance =(s+10)×6=6(s+10)
Since the distance is the same in both scenarios:
7s=6(s+10)
7s=6s+60
7s−6s=60
s=60 km/h
The distance covered is:
Distance =7s
Distance =7×60
Distance =420 km
Therefore, the distance covered is 420 km.