Brainstorm

Algebra Level 2

If two person A and B runs at 6 kmph and at 12 kmph respectively on a circular track of 6 km long . When will they meet for 1st time if they are running in opposite direction?

25 min 17.5 min 15 min 20 min

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Pratyush Pushkar by Pratyush Pushkar , 28, India

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3 solutions

Vishnu Bhagyanath
May 15, 2015

They will reach a point when their displacement along the track (taking the direction of the 6kmph runner as a reference) will be equal.

Displacement = Speed × \times Time 6 − 12 t = 6 t 6 - 12t = 6t t = 1 3 h o u r s t = \frac13 hours t = 20 m i n u t e s \boxed{t=20 minutes}

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Noel Lo
May 17, 2015

6 12 + 6 = 6 18 = 1 3 \frac{6}{12+6} = \frac{6}{18} = \frac{1}{3} hours = 20 \boxed{20} mins.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

no Mr. corksucker , Noel lo

Arun Garg - 5 years, 2 months ago
Pratyush Pushkar
May 14, 2015

since they run in opposite direcction there relative speed adds up. so , time = 6/(6+12)= 1/3 hr =20 min

1 Helpful 0 Interesting 0 Brilliant 0 Confused

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