SOLUTION: At 09 00, car A started its journey and travelled at 70km/h. At 10 30, car B started from the same place and travelled steadily on the same road. Car B took 3 1/2 h to catch up to

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Question 1072771: At 09 00, car A started its journey and travelled at 70km/h. At 10 30, car B started from the same place and travelled steadily on the same road. Car B took 3 1/2 h to catch up to car A.
a) Find the speed of car B
b) At 15 24, car B reached its destination. When did car A reach the same destination?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Amount of time between 9:00 and 10:30 is 1%261%2F2 hours.
Doing part (a) only:
CAR      SPEED         TIME           DISTANCE

A         70          1%261%2F2%2B3%261%2F2      d

B          r           3%261%2F2           d


70%281%261%2F2%2B3%261%2F2%29=%283%261%2F2%29%2Ar

-
70%2A5=%287%2F2%29r
r=70%2A5%2A%282%2F7%29
r=10%2A5%2A2
highlight%28r=100%29