Two trains approach each other at $30$ km/hr and $27$ km/hr from two places $342$ km apart. After how many hours do they meet?

5

hours

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6

hours

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7

hours

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12

hours

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Solution

The correct option is B $6$ hours
Suppose the two trains meet after $x$ hours. They,
$30 \times x + 27 \times x = 342$
$\Rightarrow 57 x = 342 \Rightarrow x = \frac{342}{57} = 6 h o u r s$ .

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Two trains approach each other at 30 km/hr and 27 km/hr from two places 342 km apart. After how many hours do they meet?

The correct option is B 6 hoursSuppose the two trains meet after x hours. They,30×x+27×x=342⇒57x=342⇒x=34257=6hours.

Two trains approach each other at $30$ km/hr and $27$ km/hr from two places $342$ km apart. After how many hours do they meet?

The correct option is B $6$ hours
Suppose the two trains meet after $x$ hours. They,
$30 \times x + 27 \times x = 342$
$\Rightarrow 57 x = 342 \Rightarrow x = \frac{342}{57} = 6 h o u r s$ .