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From two places, 60 km apart, A and B start towards each other at the same time and meet each other after 6 hours.
and B travelled with double of his speed, they would have met after 5 hours. The speed of A isHad A travelled with 2 of his speed 3
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- 4 km/hr.
- 6 km/hr.
- 10 km/hr.
- 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, | 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.