Book Maths Puzzle

A mail train takes two hours less than a passenger train to cover 192km. If the speed of the mail train is 16 km/h more than that of the passenger train find the speed of the passenger train

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Book Other Question

An aeroplane takes 40 minutes less to fly 3600 km with the wind blowing at 30 km/h than the time it takes to fly against the same wind. Find the actual speed of the aeroplane when there is no wind. If a car increases its speed by 10 km/h than it takes 36 minutes less to cover a distance of 72 km. find the original speed of the car.