SOLUTION: Sophie sets off on awalk at 6km/h. Ten minutes later, her brother Dave sets off after her on his bicycle at 15km/h. How far must Dave go to catch up with Sophie?

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Question 204816This question is from textbook Longman Mathematics for IGCSE
: Sophie sets off on awalk at 6km/h. Ten minutes later, her brother Dave sets off after her on his bicycle at 15km/h. How far must Dave go to catch up with Sophie? This question is from textbook Longman Mathematics for IGCSE

Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
d=st
For sophie: 6* 1/6 = 1 km she is ahead of dave when he starts.
Dave is traveling 9km faster than she.
9t=1
t=1/9 h to catch up to her
15 * 1/9 = 15/9 km distance dave must travel to catch up.
.
Ed