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sandeep kumar

· started a discussion

· 1 Months ago

wrong answer (Question: 107286.0 )

train and truck in question but car and train in the answer

Content Admin Review

· commented

· 1 Months ago

Yet to be approved!

Content Admin Review

· commented

· 1 Months ago

Yet to be approved!

Content Admin Review

· commented

· 1 Months ago

Yet to be approved!
deepesh sharma

· started a discussion

· 1 Months ago

wrong answer (Question: 107286.0 )

question asked for average speed of truck and train and in wexplanation you are taking car and train please check

72yogi

· started a discussion

· 1 Months ago

wrong answer (Question: 107286.0 )

sir, the avg speed of truck, car, train is 30,80,120 respectively .

avg speed formula = 2xy/x+y

sir tell me why it is not applicable in this question. and when we can use this formula ....explain in detail.

Question:
The ratio between the speeds of a truck, car and train is 3 : 8: 12. The car moved uniformly and covered a distance of 1040 km in 13 hours. What is the average speed of the truck and the train together?
Options:
A) 75 km/h 
B) 60 km/h
C) 48 km/h
D) 100 km/h
E) None of these
Solution:

Ans (a) 

Let speed of the truck, car and Train are 3x, 8x and 12x respectively.

Total distance covered by car in 13 hours = 1040 km

1040 = 13 *8x

x = 10.

Speed of the truck = 3x = 3 *10 = 30 kmph.

Speed of the train = 12X = 12 * 10 = 120 kmph.

Average speed of truck and train = (30 + 120)/2 = 75 kmph.

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