A person walks a distance from point A to B at 15 km/h, and from point B to A at 30 km/h. If he takes 3 hours to complete the journey, then what is the distance from point A to B?
Answer & explanation
Correct answer: option 4
Average Speed = \(\frac{2 × S1 × S2 }{S1 + S2}\)
= \(\frac{2 × 15 × 30 }{15 + 30}\)
= \(\frac{900 }{45}\)
= 20 km/h
Total distance from A to B & B to A = 20 × 3 = 60 km
Distance from A to B = \(\frac{60 }{2}\)
= 30 km