A student finishes the first half of an exam in 3/5 of the time it takes him to finish the second half of the exam. if the total time he takes to finish the exam is 48 minutes how many minutes did it take to finish the first half of the exam?
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let the time taken to complete the exam in second half be x.
time taken to finish in first half= 3x/5
a/q 3x/5 + x= 48
⇒(3x+5x)/5 = 48
⇒ 8x= 48*5
⇒ x= 240/8
∴ x= 30
so time taken to complete the second half of the exam = 30 minutes
time taken to complete the first half of exam= 3/5 * 30
= 3*6
= 18 minutes
and so to confirm, total time taken =30+18= 48 minutes.
time taken to finish in first half= 3x/5
a/q 3x/5 + x= 48
⇒(3x+5x)/5 = 48
⇒ 8x= 48*5
⇒ x= 240/8
∴ x= 30
so time taken to complete the second half of the exam = 30 minutes
time taken to complete the first half of exam= 3/5 * 30
= 3*6
= 18 minutes
and so to confirm, total time taken =30+18= 48 minutes.
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