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2015-03-31T16:37:36+05:30

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For first half of the distance,
d = 2760/2 = 1380 miles
speed = 560 mph
time(t₁) = 1380/560 = 2.464 hour

for second half of the distance,
d = 2760/2 = 1380 miles
speed = 820 mph
time(t₂) = 1380/820 = 1.683 hour

total time = t₁ + t₂ = 2.464 + 1.683 = 4.147 hours
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