Question:A motorist travels to a place `150`km away at an average  speed of `50`km per hour and returns at `30`km per hour .His average speed for the whole journey in km per hour is : 

A `35` 
B `37` 
C `37.5` 
D `40` 

+ Answer
C 

+ Explanation
Average speed 

`= (2xy)/(x + y)  km∕hr`

`= ((2 xx 50 xx 30)/(50 + 30))  km∕hr`

`= 37.5  km∕hr`

+ Report

Irin Moni

Editor, VCampus

Your Name

Your Email

Type of Report
Spelling MistakeIncorrect AnswerGrammar MistakeContent MissingImproper Text FormatInsufficient AnswerDuplicate QuestionImproper Sentence StructureImproper Equation/FormulaOther

Description