Question

A man walks 70km. he walk x km at 8km/h and y km at 10km/h. if the man walked at 10km/h for the time he was walking at 8km/h and at 8km/h at the time he was walking for 10km/h, he walks 72km. Find x and y.

Answer 1

Speed =6km/h

distance =1km

Time =distance/speed=1/6h

Speed =8km/h

Distance =1km

Time =distance/speed=1/8h

Average speed =Totaldistance/totaltimetaken

=1+1+

6

1

+

8

1

=2+

24

4+3

=2+

24

7

=2×

7

24

=

7

48

=6.85km/h