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Tom is travelling from city A to city B to city C. From city A to city

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Tom is travelling from city A to city B to city C. From city A to city [#permalink]

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New post 23 Feb 2017, 17:36
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  45% (medium)

Question Stats:

55% (01:26) correct 45% (01:59) wrong based on 31 sessions

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Tom is travelling from city A to city B to city C. From city A to city B, he travelled at the rate of 160 km per hour, and from city A to city B, he travelled the distance that is twice of the distance he travelled from city B to city C. What is the average speed rate from city A to city C in total?

1) Tom travelled from city B to city C at the rate of 100 km per hour.
2) The total distance from city A to city C is 600 km.
[Reveal] Spoiler: OA

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Re: Tom is travelling from city A to city B to city C. From city A to city [#permalink]

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New post 23 Feb 2017, 18:21
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AustinKL wrote:
Tom is travelling from city A to city B to city C. From city A to city B, he travelled at the rate of 160 km per hour, and from city A to city B, he travelled the distance that is twice of the distance he travelled from city B to city C. What is the average speed rate from city A to city C in total?

1) Tom travelled from city B to city C at the rate of 100 km per hour.
2) The total distance from city A to city C is 600 km.



for finding avg. speed we have to know
total distance / total time

given speed a-B= 160
distance A-B-= 2X (let)
distance B-C= X

1) avg. speed 3X/(2x/160 +x/100) = 400*3/9--------sufff
2) X+2X =600
X=200
But we have no info on speed he used to travel from B-C ----insuff

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Re: Tom is travelling from city A to city B to city C. From city A to city   [#permalink] 23 Feb 2017, 18:21
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Tom is travelling from city A to city B to city C. From city A to city

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