Question

on a 60 km track a train travels 1st 30 km with an uniform speed of 30km/hr but the driver wants to maintain an average velocity of 40km/hr for the total journey. at what uniform speed must the train travel the rest 30km to achieve the required average speed for total travel? ​

Answer 1

Explanation:

Answer:-

Explanation:

Given:-

Total Distance (d) = 60 km

Speed (v₁) during the 1st half journey = 30 km/h

Average Speed = 40 km/h

To Calculate:-

Speed (v₂) for the 2nd half = ???

Formula To be used:-

Average Speed = \frac{Total \: Distance}{Total \: Time}

TotalTime

TotalDistance

Solution:-

Average Speed = \frac{Total \: Distance}{Total \: Time}

TotalTime

TotalDistance

Average Speed = Total Distance/ t₁ + t₂

Where t₁ = 30/30 = 1 h

40 = \frac{60}{1+\frac{30}{v} }

1+

v

30

60

40 (v + 30) = 60 v

v = 60 km/h

Hence, The answer is 60 km/h.

Answer 2

Answer:

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