Problema Solution
TWO CYCLISTS LEAVE A PARK AND RIDE IN OPPOSITE DIRECTIONS, ONE AVERAGING 9 MPH AND THE OTHER 6 MPH. IF THEY HAVE TWO-WAY RADIOS WITH A 5-MILE RANGE, FOR HOW MANY MINUTES WILL THEY REMAIN IN RADIO CONTACT?
Answer provided by our tutors
let 't' represent the time in hours that they will remain in radio contact
since the ride in opposite directions we have:
9t + 6t = 5
15t = 5
t = 5/15
t = 1/3 hr
t = (1/3)*60 min
t = 20 min
the cyclist will remain in radio contact for 20 minutes.