You drive a beat-up pickup truck along a straight road for 8.4 km at 70 km/h, at which point the truck runs out of gasoline and stops. Over the next 30 min, you walk another 2.0 km farther along the road to a gasoline station.
(b) What is the time interval `Delta t` from the beginning of your drive to your arrival at the station ?

Explanation

To solve the problem, we need to find the total time interval \(\Delta t\) from the beginning of the drive to the arrival at the gasoline station. This involves two segments of travel: driving the truck and walking to the station.

### Step-by-Step Solution:

1. **Calculate the time taken to drive the truck (from point A to point B)**:
- Distance driven = 8.4 km
- Speed of the truck = 70 km/h
- Time taken to drive (denoted as \(\Delta t_{AB}\)) can be calculated using the formula:
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