Two parts of a run

Adam can cover a certain distance in 1 hr 24 min by covering two third at 4 km/hr and the rest at 5 km/hr. Find the total distance.

Correct answer:

s =  6 km

Step-by-step explanation:

v1=4 km/h v2=5 km/h  r1=320.6667 r2=1r1=132=31 332=3332=332=310.3333  t=1:24=1 hr 24 min =1+6024=1.4 hr=1.4  s1 = r1 s=v1 t1 s2 = r2 s=v2 t2 s=s1+s2 t=t1+t2  s1/v1+s2/v2=t  r1 s/v1+r2 s/v2=t s( r1/v1+r2/v2) = t  s=r1/v1+r2/v2t=32/4+31/557=6 km



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