Question
Driving at 3/5 of my original speed I am 4 hours late
for my office. What is my original time taken (km/h)?Solution
∴ Ratio of my speed = 5 : 3 Ratio of time taken = 3 : 5 Let my oroginal and present time taken be 3x and 5x ∴ 5x - 3x = 4 ⇒x = 2 ∴Actual time = 5x = 5 × 2 = 10 hrs
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