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To arrive at its destination on time the bus should have

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VP
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To arrive at its destination on time the bus should have [#permalink]

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New post 30 Oct 2008, 03:08
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To arrive at its destination on time the bus should have maintained a speed of \(V\) kmh throughout the journey. Instead, after going the first third of the distance at \(V\) kmh, the bus increased its speed and went the rest of the distance at \((1.2)*V\) kmh. As a result, the bus arrived at its destination \(X\) minutes earlier than planned. What was the actual duration of the trip?

1. \(V = 60\)
2. \(X = 20\)
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Re: DS : BUS [#permalink]

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New post 30 Oct 2008, 03:48
B.

If d is the total distance covered, then,
(d/v)*(1/3 + 2/3*1/1.2) = d/V - X
or, d/V = 9X/60

If we know X, we will get to know d/v and hence actual time taken and that will be d/V - X
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Re: DS : BUS [#permalink]

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New post 30 Oct 2008, 14:22
B

X = (d/3)/v + (2d/3)/1.2v
X = d/v(1/3+2/3/1.2)

All we need to find is d/v
stmt2 is Sufficient
Re: DS : BUS   [#permalink] 30 Oct 2008, 14:22
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To arrive at its destination on time the bus should have

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