Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.20 × 106 N, one at an angle 14.0 degrees west of north, and the other at an angle 14.0 degrees east of north, as they pull the tanker a distance 0.700 km toward the north.
What is the total work done by the two tugboats on the supertanker?
Express your answer in joules, to three significant figures.