2 friend`s A and B running up hill and then to get down length of road 440 yards A on his return journey met B going up at 20 yards from top if A has finished race 5 minute earlier than B then how much time A had taken to complete the race?
100 min
90 min
110 min
none
Explanation:
Total journey= 440 $\times$ 2=880
A meet B 20 yards from top in getting down it means he has covered 440+20=460 yards while B is 420 yards.so he is 40 yards ahead of B which is equals to 5 minute.
so 40 yards in 5 min
880 yards will be in 5 $\times$ 880/ (40) =110 minute.