Answer:
8 Hours
Explanation:
Given: 3/4 part of race completed in 6 hours.
Formula for finding speed is,
Speed=

Now, lets find out the speed at which
of the race completed.
Speed=

∴ Speed was
to complete
of the race.
Lets find out the remaining part of race:
=

∴
part of the race is yet to be completed.
Now, time taken to finish
part of race at the same speed of
.
Formula for finding time is,
Time=

Time (
)=
= 2

∴ Time taken to finish remaining
part of race is 2

Now, to find out total time taken to finish entire race is:
Total time=
Total time =

∴ Total time taken to finish entire race is 8
