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One tenth mile per second.One tenth mile per second.One tenth mile per second.One tenth mile per second.
There are 10 decimetres in one metre. Therefore, he is travelling 0.7/10 = 0.07 metres in one tenth of a second. Multiplying this by 10 gives 0.7 - therefore he is travelling at 0.7 metres per second.
7.5 already IS at a tenth . . . there is no rounding to be done.
A tenth and one tenth are the same thing.
Done.