Capgemini
Company
Numerical Ability
Time Distance and Speed
In a race from point t. X to point Y and back, Jack averages 30miles/hr to point Y and 10 miles/hr back
to pr X.Sandy averages 20 miles/hr in both directions. If Jack and Sandy start race at same time,
who’ll finish 1st
Read Solution (Total 4)
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- The Average speed of Jack for covering a distance is 15miles/hr (based on 2xy/x+y)
and that of sandy is 20miles/hr...so sandy speed is more hence if they start at same time Sandy reaches First... - 12 years agoHelpfull: Yes(29) No(1)
- Apply (2xy)/(x+y) then jack's avg speed is 15miles/hr and sandy's avg speed is 20miles/hr...Hence sandy will finish first...
- 12 years agoHelpfull: Yes(15) No(1)
- Let the distance b/w X and y is 60 miles.
Time taken by Jack frm X to y is 2 hrs.
Time taken by Jack frm Y to X is 6hrs.
Total time taken by jack is 6+2=8hrs.
Now time taken by sandy frm x to y is 3 hrs
and for y to X is also 3hrs
Total time taken by sandy is 6 hrs..
there fo sandy will finish first . - 11 years agoHelpfull: Yes(3) No(0)
- Jack will finish first because the avg speed for him in both directions is more than Sandy's which we can calculate using 2xy/x+y
- 11 years agoHelpfull: Yes(0) No(3)
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