Latest SSC Aptitude Question SOLUTION: A car travels three-fourth of the distance at the speed of 25 kmph and the remaining distance at the speed of 10 kmph. What is the average speed of the car for entire journey ?

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(#M40027532) SSC Numerical Ability question Mental Ability Keep an EYE

A car travels three-fourth of the distance at the
speed of 25 kmph and the remaining distance at
the speed of 10 kmph. What is the average speed
of the car for entire journey ?
(A) 12.5 kmph
(B) 21.25 kmph
(C) 17.75 kmph
(D) None of these

Asked In SSC MAN (10 years ago)

Solved Mithun Kumar Kesari Read Solution (2)

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Read Solution (2) :

Sudhanshu Mishra  (9 years ago)

Let the total distance be x km.
Then car travels (3/4)x km with a speed of 25 km/h,
so time taken during this journey,t1= ((x(3/4))/25) hr = (3x/100) hr.
remaining distance = ( x - (3x/4)) = (x/4) km ,
car travels this remaining distance with a speed of 10 km/h,
time taken during this journey, t2= ((x/4)/10) hr = (x/40) hr.
total time, T = t1 + t2 = (3x/100) + (x/40) = (11x/200) hr
avg speed of total journey = ( total distance / total time taken )
= (x/(11x/200)) = (200/11) = 18.18 km/h

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Mithun Kumar Kesari  (10 years ago)

avg. speed=1/[(3/4)*(1/25)+(1/4)*(1/10)]=200/11 kmph= 18.18 kmph

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