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The speed of both Anna and Elsa relative to each other = 60 + 50 = 110 MPH Total distance covered between them = 385 M Hence, time taken for them to meet each other = relative distance covered /relative speed = 385/110 = 3.5 hrs.
Answer

Answer:

The distance between the sisters at the time of starting  =   385 Miles

The average relative speed of the sisters  when travellinmg towards each other  =  60+50 = 110 MPH

Time taken to meet =              Distance at the time of starting/  Relative Speed =  385/110 = 3,5 Hrs

Therefore  time taken for the sisters to meet each other  after they set out = 3..5 Hrs  

Answer
Anna covers 60 miles in 1hour Elsa covers 50 miles in 1 hour Total distance covered in 1 hour = 60+50 = 110 miles Time = distance/speed Time = 385/110 = 3.5 hour Anna and Elsa will meet after 3.5 hour
Answer

We are using here the relative speed approach.

  speed of Anna = U=60 miles per hour

since Elsa is moving in direction opposite to that of Anna so speed of ELSA would be = -50 miles per hour

let speed of Elsa be V,V = -50 miles per hour.

relative speed of anna and elsa= U-V = 60-(-50)=110

hence time required to meet them =distane covered / relative speed

                                                     385 / 110=3.5

hence time required by Anna and Elsa to meet is 3.5hours.

Answer
Anna speed is 60 MPH whereas Elsa speed is 50 MPH. In one hour Anna would have travelled 60 miles and Elsa 50 miles. So total they have travelled 110 Miles. So their collective speed (relative speed, since they are moving towards each other the speeds will get added) is 110 MPH. So, to travel 385 Miles the time required will be 385/110 which is 3.5 hours.

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