Keerthana takes 9 hrs 20 minutes in walking a distance and riding back to same place where she started. She could walk both ways in 11 hrs… — Answer & Discussion

Keerthana takes 9 hrs 20 minutes in walking a distance and riding back to same place where she started. She could walk both ways in 11 hrs 15 minutes. The time taken by her to ride back both ways is:

A7 hrs 25 min
B7 hrs 35 min
C7 hrs 45 min
D7 hrs 15 min

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Discussion 1

CCommunity31 May 2019

Time taken by Keerthana to walk both ways = 11 hrs 15 minutes = (11 × 60) + 15 = 675 min

(? 1 hr = 60 min)

⇒ Time taken by Keerthana to walk one way = 675/2 = 337.5 min

Time taken by Keerthana in walking a distance and riding back = 9 hrs 20 min = (9 × 60) + 20 = 560 min

⇒ Time taken by Keerthana to ride one way = 560 – 337.5 = 222.5 min

⇒ Time taken by her to ride back both ways = 222.5 × 2 = 445 min = (7 × 60) + 25 = 7 hrs 25 min

∴ Time taken by her to ride back both ways = 7 hrs 25 min