general Maths Puzzle

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S, M, H, D, W, ?, ?

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general Other Question

0, 2, 5, 7, 10, 13, 15, 18, 20, ?, ?, ? A railway track runs parallel to a road until a bend brings
the road to a level crossing. A cyclist rides along to work along the
road every day at a constant speed of 13 miles per hour. He normally
meets a train that travels in the same direction at the crossing. One
day he was late by 20 minutes and met the train 7 miles ahead of the level crossing. Can you figure out the speed of the train?