BrainBashers Puzzles

A few weeks ago I went to to visit my grandma, who lives 120 miles away, and it took me exactly 3 hours.

Last Saturday morning I made the exact same journey.

The distance was exactly the same, the traffic was the same, there were no extra delays, I travelled at the same speed.

Everything was the same, but it took be 180 minutes instead. Why?

[Ref: ZZNH]

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