A man travels x km at 8 km/h and y km at 20 km/h. His total time is 3.5 hours. The total time taken to travel (2x+4) km at 8 km/h and 3y km at 20 km /h is 5 hours. Find x and y.
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Answer:
Distance, D
1
=30km
Speed s
1
=60km/hr
time=
60
30
=
2
1
hr
Distance D
2
=30km
Speed s
2
=40km/hr
Time, t
2
=
40
30
=
4
3
hr
Total time T=t
1
+t
2
=
2
1
+
4
3
=
4
5
hr=
4
5∗60
min=75 min
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