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Question
Two cars, 15 km apart one is turning at a speed of 50kmph
other at 40kmph . How will it take to two cars meet.
 Question Submitted By :: Guest
I also faced this Question!!     Rank Answer Posted By  
 
  Re: Two cars, 15 km apart one is turning at a speed of 50kmph other at 40kmph . How will it take to two cars meet.
Answer
# 1
3/2 hours
 
Is This Answer Correct ?    6 Yes 4 No
Guest
 
  Re: Two cars, 15 km apart one is turning at a speed of 50kmph other at 40kmph . How will it take to two cars meet.
Answer
# 2
lets say car A is travelling at 50Kmph and Car B at 40 Kmph.

Since the question is not very clear, we have two 
possibilities. That the cars are either travelling in same 
direction or they are travelling in opposit directions.

If the cars are travelling in the same direction then again 
there are two possibilities
First: Car B is behind Car A - then the cars will never 
meet.
Second: Car A is behind Car B then they will meet after 90 
mins (one and a half hour) Car B travells 60 Kms in 90 mins 
and Car A travells 75 Kms in 90 mins. Car A is 15 Kms 
behind Car B so it has to cover those 15 Kms in the same 
time to reach car B which is 60+15 = 75 kms.

If the cars are travelling in the opposite direction then 
they will meet in approximately 10 minutes. this can be 
calculated as follows.

let us say they meet at a point X as shown below

    A -----------------------X----------------B
      ---->     15-X    <--- ! ---->  X   <----

since both travel for the same amount of time let the time 
taken be T hours.(since the speed is in KMPH time taken 
will be calculated in hours)

From the above B has to travel X Kms and A the remaining 
distance which is 15-X kms ( Distance between A & B is 
15Kms)

From the formula Distance = Speed * Time we can say 
     Time = Distance / Speed

Hence T(A) = (15-X)/50  _______ Eq 1
  and T(B) = X/40    __________ Eq 2
Since T(A) = T(B), 
we have (15-X)/50 = X/40  ______Eq 3
By solving the above Eq 3 we get X = 6.666 Kms
Substituting X in either of Eq 1 or Eq 2 
we get T = 0.1666 Hrs which is approximately 10 Mins.
 
Is This Answer Correct ?    0 Yes 1 No
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