peter can cover a certain distance in 1 hr.24min. by covering two-third of the distance at 4kmph and the rest at 5kmph.fimd the total distance.
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If you let x to be the total distance,
Peter ran two-third (2/3) of x or d1= 2x/3 at a rate of 4 km/hr
And ran remain x - 2x/3 or d2 = x/3 at a rate of 5 km/hr
Total time is 1 hr 24 min = 1 hr + 24 min*(1 hr/60min) = 1hr + 2/5 hr = 7/5 hr
d1/4 km/hr +d2/5 km/hr = 7/5 hr
(2x/3)/4 + (x/3)/5 = 7/5
HOPE THIS HELPS
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