Aptitude - Time and Distance

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Time and Distance

A man travels by bus for 20 hours and they by train for 05 hours . if the average speed of the bus was 20 kmph and that of the entire journey was 24 kmph. What was the average speed of the train?

(A) 44kmph
(B) 30 kmph
(C) 36 kmph
(D) 40 kmph

Total Answers and Comments: 4

Last Update: October 02, 2009 Asked by: arvinth_ceg

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Best Rated Answer

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Submitted by: priyanka.kalia13

40kmph

Above answer was rated as good by the following members:
siddhi_ahir, hari_prasad84, amitdatar122

June 30, 2008 03:51:10

priyanka.kalia13

Member Since: June 2008 Contribution: 2

RE: Time and Distance

40kmph

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3 0

Overall Rating: +3

June 30, 2008 03:53:16

priyanka.kalia13

Member Since: June 2008 Contribution: 2

RE: Time and Distance

(d)56

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October 05, 2008 03:57:46

skalra

Member Since: October 2008 Contribution: 2

RE: Time and Distance

Out of total 25 hrs of travelling 20 hrs (4/5th) is done by bus @ 20km/hr and 5 hrs (1/5th) is done by train @ xkm/hr.

and the average speed f the whole journey is 24 km/hr.

so 4/5 * 20 + 1/5 * x 24

which gives x 40 km/hr.

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October 02, 2009 11:27:08

mouli161

Member Since: October 2009 Contribution: 1

RE: Time and Distance

Average speed 2ab/(a+b)
a 20
b ?
Avg speed 24

Substitute the values you will get b 30.

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