A person walked from his house to a supermarket at the rate of 10 km/h and walked back at the rate of 5 km/h. For the whole journey, he took 1 hour 30 minutes. Find the distance from his house to the supermarket (in km).
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 5.
Distance = [xy/(x + y)] × time
Distance = [10 × 5/(10 + 5)] × 1.5
Distance = (50/15) × 1.5
Distance = 5 km