A motorist travel to a place 150 km away at an avearge speed of 50 km/hr and returns ar 30
km/hr.His average speed for the whole jouney in km/hr is  Choices:  A) 36.5 km/hr  B) 37.5 km/hr  C) 35.5 km/hr  D) 34.5 km/hr  E) None of these
Explanation:   Average speed will be   2xyx+ykm/hr   = \frac{2(50)(30)}{50+30} km/hr   = 37.5 km/hr   Answer: Option 37.5 km/hr
<result>B</result>
A motorist travel to a place 150 km away at an avearge speed of 50 km/hr and returns ar 30
km/hr.His average speed for the whole jouney in km/hr is