There are 1000 m in a km and 3600 sec in an hr. Thus, multiplying 40.32 km/hr by 1000 m/km gives 40320 m/hr. Dividing this by 3600 sec/hr gives 11.2 m/sec.
Of course, the two operations can be done in the other order.
Some calculators have unit conversions built-in. Without knowing the make and model of your calculator, I can't tell you whether yours does so or not, let alone tell you the keystroke sequence to do it.
Kilometers per Hour
km/h:
40.32
Meters per Second
m/s:
11.20
Feet per Second
ft/s:
34.14
Miles per Hour
MPH:
25.05
Nautical Miles per Hour
Knots:
21.77
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