Mohan finishes a journey by scooter in 5 hours. He travels the first half of the journey at 30 km/h and the second half of the journey at 20 km/h. The distance covered by him is:

140 km 100 km 120 km 130 km

120 km

Average Speed = \(\frac{2 × S1 ×S2  }{S1 + S2}\) = \(\frac{2 × 30 ×20  }{30 + 20}\) = \(\frac{1200  }{50}\) = 24 km/h Distance = Speed × Time = 24 × 5 = 120 km