A car travels first half of the motion with a speed of 60km/he. What should be the speed for the second half of the motion so that its average speed is 90km/hr
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average speed= 90km/hr
let speeds are x and y
given x=60 y=?
find y value
avg. speed= 2*x*y/x+y
90 =2*60*y/60+y
90(60+y)= 120y
5400+90y=120y
30y=5400
y=540/3
y=180km/hr is answer
let speeds are x and y
given x=60 y=?
find y value
avg. speed= 2*x*y/x+y
90 =2*60*y/60+y
90(60+y)= 120y
5400+90y=120y
30y=5400
y=540/3
y=180km/hr is answer
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