Answer :
To get the result we can use knowledge that reading is 2 times longer than HW.
To find this value we just have to multiply 42 times 2 so
40*2=80
Its 1 hour and 20 min - its the result
To find this value we just have to multiply 42 times 2 so
40*2=80
Its 1 hour and 20 min - its the result