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Rinkesh Kumar

· started a discussion

· 1 Months ago

Qid 185271 (Question: 185271.0 )

Sir last part of the question given speed is correct....

Question:
Two cyclists start from the same place in opposite directions. One goes towards north at 18 km/hr and the other goes towards south at 20 km/hr. What time will they take to be 47.5 km ?
Options:
A) 2 \(\cfrac{1}{4}\) hours
B) 1 \(\cfrac{1}{4}\) hours
C) 2 hours 23 minutes
D) 23 \(\cfrac{1}{4}\) hours
Solution:
Ans: (b)

1st is moving North at 18 kmph i.e +18 kmph, 2nd towards south at 20kmph i.e -20kmph,

New velocity of 1st wrt 2nd would be = v(1st)-v(2nd)

I.e. 18-(-20)

=38kmph

Now distance to be covered is 47.5km

Therefore time=distance/velocity(relative)

=47.5/38

=1.25 hours..

Knowledge Expert

· commented

· 1 Months ago

@Ashish hiralkar

Q is: Two cyclists start from the same place in opposite directions. One goes towards north at 18 km/hr and the other goes towards south at 20 km/hr. What time will they take to be 47.5 km ?
Sol is:
1st is moving North at 18 kmph i.e +18 kmph, 2nd towards south at 20kmph i.e -20kmph,
New velocity of 1st wrt 2nd would be = v(1st)-v(2nd)
I.e. 18-(-20)
=38kmph
Now distance to be covered is 47.5km
Therefore time=distance/velocity(relative)
=47.5/38
=1.25 hours..

We fixed the question, as we found an error.

Ashish hiralkar

· commented

· 1 Months ago

IN QUES. U HAVE asked What time will they take to be speed 47.5 Km/hr. but in solution time =DISTANCE/SPEEED ...U HAVE PUT IT IN DISTANCE FORM ...?? SO MY QUES IS its should be asked at what time will they be at 45 km.....and not 45 km/hr ?? plz correct me ??

Knowledge Expert

· commented

· 1 Months ago

So, whats your doubt?
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