ans plz ....

twowomen ganga andsaraswati ,working separately canmown a field in 8 and 12 hrsrespectively . if they work instretches of one hour alternatelynga beginning at 9am ,when willthe moving be finished.

Mohini
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RS

Rohit
04 अप्रैल

Ganga work is 8 hrs, while saraswathi is 12hrs. Avg of 8 & 12 is 24. So let total work be 24units. Ganga can do 3 units/hr ; Saras can do 2units/hr. On combination it is 5units. Since they work alternatively. So it's 5units/2hours. Which give 20units in 10hours. (ie. 5pm). Remaining 4units , where 1st 3 units by Ganga which is 1 Hr. ( ie. now 6pm) and 1 unit by Sara which is 30mins. So Ans. 6pm30mins