Trains Boats and Streams Practice Test 4 with solutions

Question : 34 of 40

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A train travelled a distance of 10 km, 20 km and 30 km at speeds of 50 km, 60 km and 90 km per hour respectively. The average > speed of the train (in km/hr) was:

66.67
60
69.23
None of these

Validate

Solution:

Distance	Speed	Time
10 km	50 kmph	1/5 hrs
20 km	60 kmph	1/3 hrs
30 km	90 kmph	1/3 hrs

Average =

{\Total \distance}/{\Total \time}

{10+20+30}/{1/5+1/3+1/3}

{60}/{{3+5+5}/{15}}

{60}/{13} × 15

{900}/{13}

= 69.23 kmph

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