Latest IBM Aptitude Question SOLUTION: If A driver drives a car four times a lap 10,20 30,60 kmph what is his average speed.

• Placement Papers
• /
• IBM
• /
• Numerical Ability
• /
• Time Distance and Speed

IBM Question Papers: IBM Interview Experience(49) IBM Company Profile

(#M40084173) IBM Numerical Ability question Keep an EYE

If A driver drives a car four times a lap 10,20 30,60 kmph what is his average speed.

Asked In IBM hima (9 years ago)

Unsolved Read Solution (5)

Is this Puzzle helpful?   (17)   (0) Submit Your Solution Time Distance and Speed

Read Solution (5) :

Deepak Yadav  (9 years ago)

avg. speed = 2xy/x+y
so, take 10 & 20 for first two lap
2*10*20/10+20 = 40/3......................(1)
and,
take 30 and 60 as same,
2*30*60/30+60 = 40..........................(2)
therefor,
take avg. of two lap from 1 & 2, therefoe
2*(40/3)*40/(40/3)+40 = 20 ans.

Is this solution Helpfull? Yes (21) | No (7)  

Anna  (9 years ago)

Let the lap be x km
Time taken by him to cover 4x km
=x/10 +x/20 +x/30 +x/60 hrs
=12x/60 hrs
=x/5 hrs
Therefore average speed
=4x divided by x/5
=4x*5/x
=20 kmph

Is this solution Helpfull? Yes (17) | No (1)  

Panna Lal Patodia  (9 years ago)

Assume that length of lap is 60 km. At speed of 10 kmph, it takes 6 hours. Similarly, at speed 20, time taken 3 hours, at speed 30, time taken 2 hours and at speed 60, time taken 1 hour. Total km travelled = 240 km and Total time taken = 12 hours. Average Speed = 240/12 = 20 kmph.

Is this solution Helpfull? Yes (9) | No (2)  

ssd  (9 years ago)

4/(1/10+1/20+1/30+1/60)=20kmph

Is this solution Helpfull? Yes (7) | No   

VIKASH KUMAR  (9 years ago)

10+20+30+60/4=30kmph

Is this solution Helpfull? Yes | No (15)  

Please Login to Read Solution.