Q-12 Mansi travels 300 kms to her native partly by train and partly by bus. She takes 4 hours, i

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Q-12 Mansi travels 300 kms to her native partly by train and partly by bus. She takes 4 hours, if she travels 60 kms by train and the remaining by bus. If she travels 100 kms by train and the remaining by bus, she takes 10 minutes longer. Find the average speed of the train and the bus separately.