Answers

2016-07-22T12:22:11+08:00
Assume 10km is the speed or 10kph;

d1=d2;
t1 + t2 = 1.333 hours(1hr and 20 min);
5/speed + 5/10kph=1.3333hr;

5/speed=1.333-.5;
speed=5/.833333;
speed=6kph
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