Answer:
Same i.e. $40
Explanation:
It is given that,
Kelly works 2 days for 4 hours each day and earns $5 an hour.
Len works 5 days for 2 hours each day and earns $4 an hour.
For Kelly,
Earning = (2×4)×$5 = $40
For Len,
Earning = (5×2)×$4 = $40
It means that the earning for both Kelly and Len is same i.e. $40.