SELF Maths Puzzle Logical Reasoning Coding Decoding

If HARD is coded as 1357
and SOFT is coded as 2468
what will 21448 stand for?

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SELF Other Question

what is the next number of following series
1,5,5,3,10,10,5,6,...
At noon, ship A is 100km west of ship B. Ship A is sailing east at 35 km/hr and ship B is sailing north at 25km/hr. How fast is the distance between the ships changing at 4.00pm.