Home » Aptitude » Speed, Time and Distance » Question
  1. From two places, 60 km apart, A and B start towards each other at the same time and meet each other after 6 hours.
    Had A travelled with
    2
    of his speed
    3
    and B travelled with double of his speed, they would have met after 5 hours. The speed of A is
    1. 4 km/hr.
    2. 6 km/hr.
    3. 10 km/hr.
    4. 12 km/hr.
Correct Option: B


Let the speed of A = x kmph and that of B = y kmph
According to the question,
x × 6 + y × 6 = 60
⇒  x + y = 10    ....(i)

and,  
2
x × 5 + 2y × 5 = 60
3

⇒  10x + 30y = 180
⇒  x + 3y = 18    ...(ii)
From equations (i) × (3) – (ii)
3x + 3y – x – 3y = 30 – 18
⇒  12x = 12
⇒  x = 6 kmph.



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