Solve the equation for x 2/5(10x+15)=26

x=5

Step-by-step explanation:

multiply both sides by 5/2

then subtract 15 (inverse operations) from both sides (10x+15-15=65-15)

then divide both sides by 10 (10x/10=50/10)

x=5

Let speed of current be x mph 

upstream speed = ( 10-x) mph 

downstream speed = ( 10 + x) mph 

time = distance / speed 

4/ ( 10-x) = 6/ (10+x ) 

cross multiply 

60-6x = 40+4x 

10x = 20 

x = 2 mph answer 

check 

4/ (10-2) = 4/8 = 1/2 hour 

6/ (10+2) = 6/12 = 1/2 hour