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A geographer maps the population density of two towns. Town X covers 120 km² and has 48,000 residents. Town Y covers 180 km² with 72,000 residents. What is the difference in population density (per km²) between the two towns?
Town X: 48,000 / 120 = <<48000/120=400>>400 per km²
Town Y: 72,000 / 180 = <<72000/180=400>>400 per km²
Difference: 400 - 400 = <<400-400=0>>0
A high school science lab uses two types of batteries. Type A powers a device for 6 hours per battery, and Type B lasts 9 hours. If a project requires 54 hours of continuous operation, and the student uses 4 Type A batteries, how many Type B batteries are needed as replacements?
Type A total: 4 × 6 = <<4*6=24>>24 hours
Remaining hours: 54 - 24 = <<54-24=30>>30 hours
Each Type B gives 9 hours: 30 / 9 = <<30/9=3.33>>3.33 → round up to 4
A cloud consultant analyzes data migration speeds. A 720 GB file transfers at 45 Mbps over a secure connection. How many minutes will the transfer take? (Note: 1 byte = 8 bits)