PHYSICS: The Work Done in Pulling a Supertanker?

Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.40�10^6 N , one at an angle 16.0 degrees west of north, and the other at an angle 16.0 degrees east of north, as they pull the tanker a distance 0.840 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.