Walking at a speed of 5 km per hour, a man covers a certain distance in 3 hours. If he covers the same distance once by car at a speed of 30 km per hour and once by cycle at a speed of 15 km per hour, what will be the time taken by him?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 30 minutes by car and 1 hour by cycle.
The distance stays the same in all three journeys, so it is found from the walk first; then time = distance ÷ speed for each vehicle.
Distance walked in 3 hours at 5 km per hour: \(5\times3=15\) km
Time by car at 30 km per hour: \(\displaystyle\frac{15}{30}=\frac{1}{2}\) hour \(=30\) minutes
Time by cycle at 15 km per hour: \(\displaystyle\frac{15}{15}=1\) hour