Book Maths Puzzle

A certain distance is covered with a certain speed. If
1/3rd of the distance is covered in twice the time, Find the ratio of this speed to that of the original speed

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Book Other Question

B is twice as fast as A and C is twice as fast as B. If A alone can complete the job in 24 days, how many days will A, B and C take to complete the job working together? How many seconds will it take for a train 120 metres long moving at the rate of 15 m/sec to overtake another train 160 m long running from the opposite side at the rate of 90 km/hr?