When the Total Row Lies

The partners are tied at one zone each: Swift wins the easy zone with 258 on-time deliveries against Speedy's 92, and Speedy wins the hard zone with 180 against 50

Speedy's overall on-time rate is 76% against Swift's 68%, so Speedy actually leads overall by 8 percentage points

Swift is the better partner and no zone-level breakdown can change that: both handled exactly 400 orders, so the totals 77% and 68% are already a fair like-for-like comparison

Speedy's on-time rate beats Swift's in both zones — 92% vs 86% in the easy zone and 60% vs 50% in the hard zone — and Swift leads on the Total row only because 300 of Swift's 400 orders came from the easy zone while 300 of Speedy's came from the hard zone