Use the concept of
Relative VelocityAt 1:00 PM
Janice must have covered 60 miles in 2 hours ...... (from 11:00 AM to 1:00 PM at a speed of 30 mph)
Her brother starts chasing her at 45 - 30 = 15 mph
So, \(time required = \frac{60}{15} = 4 hours\)
Add 4 hours to 1:00 PM, that will be 5:00 PM
Hence, option E
_________________
I hope this helps!
Regards:
Karun Mendiratta
Founder and Quant Trainer
Prepster Education, Delhi, Indiahttps://www.instagram.com/prepster_education/