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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## Everyday Ashwin starts at 3:00 pm from his house to pick... tagged by: BTGmoderatorLU ##### This topic has 1 expert reply and 0 member replies ### Top Member ## Everyday Ashwin starts at 3:00 pm from his house to pick... Everyday Ashwin starts at 3:00 pm from his house to pick up his son from school. They reach their house at 5:00 pm. one day school was over at 3:00 pm. Ashwin, not aware of this, started from home as usual. He met his son on the way and they reached home 20 minutes earlier than usual. If the speed of his car is 55 kmph, find his son speed (kmph). (A) 10 (B) 11 (C) 12 (D) 15 (E) 16 The OA is B. I'm really confused with this PS question. Please, can any expert assist me with it? Thanks in advanced. ### GMAT/MBA Expert Legendary Member Joined 14 Jan 2015 Posted: 2667 messages Followed by: 122 members Upvotes: 1153 GMAT Score: 770 LUANDATO wrote: Everyday Ashwin starts at 3:00 pm from his house to pick up his son from school. They reach their house at 5:00 pm. one day school was over at 3:00 pm. Ashwin, not aware of this, started from home as usual. He met his son on the way and they reached home 20 minutes earlier than usual. If the speed of his car is 55 kmph, find his son speed (kmph). (A) 10 (B) 11 (C) 12 (D) 15 (E) 16 The OA is B. I'm really confused with this PS question. Please, can any expert assist me with it? Thanks in advanced. If Ashwin drives at 55 km/hour and his roundtrip drive takes 2 hours, then each leg of the trip takes one hour, and is exactly 55km. If they arrive home 20 minutes, or 1/3 hour early, we know he must have saved 10 minutes or 1/6 hour on each leg of the trip. Put another way, to pick up his son, Ashwin traveled for 5/6 of an hour, instead of a full hour. In that remaining 1/6 hour, Ashwin would have traveled an additional 55 * (1/6) = 55/6 km, so this must be the distance that his son covered. (Alternatively, we know that Ashwin covered 55 * (5/6) miles. If the total distance is 55 km, then his son must cover the remainder. 55 - 55 * (5/6) = 55 * (1/6) or 55/6. To summarize. In 5/6 of an hour, the son would cover 55/6 km. If his speed is r, then r * (5/6) = 55/6); r = 11. The answer is B _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

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