Calculate the distance between the equator (latitude 0) and a city Z in Egypt (latitude 30N).

To calculate the distance between the equator (latitude 0) and a city Z in Egypt (latitude 30N), we need to use the formula for calculating the length of a meridian arc: distance = (latitude of Z) × 111.13 km Using this formula, we can calculate the distance between the equator and the city Z in Egypt as follows: distance = 30N × 111.13 km/N distance = 3,333.9 km Therefore, the correct answer is 3,330 km (rounded to the nearest 10 km).