(a) If an electric car is capable of going 225 km on a single charge, how many charges will it need to travel from Seattle, Washington, to San Diego, California, a distance of 1257 mi, assuming that the trip begins with a full charge?

Key Concepts

Unit Conversion

Unit conversion is the process of converting a quantity expressed in one unit to another unit. In this question, the distance from Seattle to San Diego is given in miles, while the electric car's range is in kilometers. To solve the problem, it is essential to convert miles to kilometers using the conversion factor that 1 mile is approximately 1.60934 kilometers.

Distance and Range Calculation

Understanding the relationship between distance, range, and the number of charges is crucial. The range of the electric car indicates how far it can travel on a single charge. By dividing the total distance of the trip by the car's range, one can determine how many full charges are needed to complete the journey, accounting for the initial full charge.

Rounding Up for Practicality

In practical scenarios, when calculating the number of charges needed, it is important to round up to the nearest whole number. This is because even if the calculation suggests a fraction of a charge, the car cannot take a partial charge; thus, any remaining distance after the last full charge would require an additional charge to complete the trip.