If a person travel from X to Y at 70 km/hr speed and back to Y to C at a speed of 30 km/hr find his average speedA50 km/hrB42C21 km/hrD40 km/hrAnswer: B. 42 Read Explanation: Speed= 2xy/(x + y) = 2 × 70 × 30/(100) = 4200/100 = 42Read more in App