Question 187008
Use equation 


t(1/rate1 + 1/rate2) = 1


rate1 = raphael's rate = 15 hrs, rate2 = janas rate = x 




t(1/15+1/x)=1


t is given as t=6


----> 6(1/15+1/x)=1


1/15+1/x=1/6



2x+30=5x


30=3x


x=10


Ans: jana can load the truck in 10 hrs