The Management of a Parcel Delivery Firm in Accra, Ghana

The management of a parcel delivery firm in Accra, Ghana know that the chances of a parcel being delivered on time are 0.6, 0.85 or 0.7 depending on whether it goes on van A, B or C respectively. The chance of being on van A is 0.4 and the chance of being on van B is 0.35. What is the overall probability that a parcel will be delivered on time (3 decimal places) ?

A) 0.634
B) 0.659
C) 0.683
D) 0.713