Question

how many hours in 20%of 40%of 4hrs 20min?
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Answer 1

Two ways.

[1] Working with HOURS.

T = 7 h 20 min = H + M

H = 7 h

M = 20 min, but 1 min = h/60, then M = 20 . h/60 = 20/60 h = 1/3 h = 0.33.. h

T = H+M = 7 1/3 h = 7.33.. h

[2] Working with MINUTES

T = 7 h 20 min = H + M

H = 7 h, but 1 h = 60 min, then H = 7 . 60 min = 420 min

M = 20 min

T = H+M = 440 min

or T = 440 . h/60 = 7.33.. h

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