Question

A body covers first-half of its journey with speed 20 km per hour and the second half with speed 40km per hour. Find the average speed of the body for the whole journey

Answer 1

Answer:

800/R

Explanation:

ACCORDING TO THE QST....

V=20KMPH

U=40KMPH

IF THE TOTAL DISTANCE IS 2R ,THEN R KM DISTANCE IS COVERED WITH 20 KMPH

SO,TIME(T)= R/20

AND TIME TAKEN FOR ANOTHER HALF IS

t=R/40

SO,THE AVERAGE SPEED IS = 800/R