A horse covers a certain distance in 40 minutes when it runs at a speed of 60 km/hr. At what speed must it run to cover the same distance in 30 minutes?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 80 km/hr
The distance stays the same, so the new speed is this distance divided by the new time.
Distance \(\displaystyle =60\times\frac{40}{60}=40\) km
New time \(=30\) minutes \(\displaystyle =\frac{1}{2}\) hour
New speed \(\displaystyle =\frac{40}{1/2}=80\) km/hr