Mike and Ike can assemble a swing set in 1 1/2 hrs. it takes IKE 4 hrs longer than MIKE to assemble it.How long does it take MIKE,alone to assemble the Swing Set

LET Workload =1

IKE 1/4 per hour

MIKE 1/x per hour

so (1/4)+(1/x)=1/(3/2)

x=12/5

MIKE 2 2/5  hours to assemble the Swing Set