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applied prob

Expert replies
Source: — Problem Solving |

by arocks » Sat Oct 06, 2007 12:45 pm
Not sure if this is the quickest way -

If the car is travels at 75Km/hr, it would take 48 sec (Dist/Speed or 1/75; convert hr into sec.) to cover 1 Km

But it is traveling at xKm/hr and takes 2 sec. more than if it traveled at 75km/hr; so it takes 50 sec.

D=1Km;
T=50/60*60 hr or 1/72 hr
So, S=D/T or 1/(1/72) or 72Km/hr

Ans:B
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