A train moves with a speed o f`30kmh^(-1)` in the first 15 minutes,with another speed of `40kmh^(-1)` the next 15 minutes,and then with a speed of `60 kmh^(-1)` in the last 30 minutes. Calculate the average speed of the train of train for this journey.

A train moves with a speed o f`30kmh^(-1)` in the first 15 minutes,wit

1.	A train moves with a speed o f`30kmh^(-1)` in the first 15 minutes,with another speed of `40kmh^(-1)` the next 15 minutes,and then with a speed of `60 kmh^(-1)` in the last 30 minutes. Calculate the average speed of the train of train for this journey.
Answer» Correct Answer - `47 . 5 kmh ^(-1)`

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A train moves with a speed o f`30kmh^(-1)` in the first 15 minutes,with another speed of `40kmh^(-1)` the next 15 minutes,and then with a speed of `60 kmh^(-1)` in the last 30 minutes. Calculate the average speed of the train of train for this journey.

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