The distance between Olien's house and her school hostel is ^@37 \space km \space 503 \space m ^@.
For reaching her house from the hostel,
she covers ^@30 \space km \space 146 \space m ^@ by taxi,
^@ 5 \space km \space 115 \space m ^@ by rickshaw and the rest of the
distance on foot. How much distance, did Olien cover on foot?