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Time speed and distance problem - require assistance

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kichha51
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Time speed and distance problem - require assistance [#permalink] New post   07 Jun 2011, 11:33
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Let find the max speed of the bus which it exactly reach the crossing gate when train reach.

Train speed is 90km/h.
90 km = 1hr
1km = 1/90 hr ( This is the distance the train reach the crossing)

Bus speed is B, since both has to collide, bus has to reach the crossing in 1/90 hr (time taken for train to reach)

1/90 hr = 700m = 0.7 km
1hr = 0.7 * 90 km = 63 km

Bus max speed should be 63km/h

Answer is B



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Re: Time speed and distance problem - require assistance [#permalink] New post   07 Jun 2011, 13:02
Since the train is 100m long, the bus should reach at crossing after 1.1/90 hr to avoild collusion.
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puneetj
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Re: Time speed and distance problem - require assistance [#permalink] New post   10 Jun 2011, 22:45
if it travels at a little less than 63kh/hr it will collide with the front of the train and if it travels just above 57km/hr it will collide with the end of the train
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Re: Time speed and distance problem - require assistance [#permalink] New post   11 Jun 2011, 03:12
The bus' speed has to be 70% of the train's speed for them to travel 700m and 1000m respectively in the same time. Hence, the speed of the bus should be 63kmph...
Option B.



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Re: Time speed and distance problem - require assistance [#permalink]
11 Jun 2011, 03:12
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