The rate of work done= Total work done /time take.

For 60kg persons,

total work done=Change in potential energy

=mgH

=60gH

Rate of work done=60gH/12=5gH

for a 50kg person,

total work done=Change in potential energy

=mgH

=50gH

rate of work done=50gH/11

therefore the ratio of the rate of work done=5gH*11/50gH

=11/10

=1.1