Car P covered 30 km in 20 minutes, Car Q covered 42 km in 35 minutes, whereas Car R covered 40 km in half an hour. Which car(s) have the maximum speed?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → P
The times differ, so the speeds are compared in one unit. In km/h, speed \(=\) distance \(\times\displaystyle\frac{60}{\text{minutes taken}}\):
Car P: \(\displaystyle 30\times\frac{60}{20}=90\) km/h
Car Q: \(\displaystyle 42\times\frac{60}{35}=72\) km/h
Car R: \(\displaystyle 40\times\frac{60}{30}=80\) km/h
Car P alone has the maximum speed.