Radio radius

Two friends have shortwave radios with a range of 13 km. The first of them travels by train at a speed of 48 km per hour along a straight section of track, from which the second of the friends is 5 km away. How long will radio friends be allowed for both friends?

Correct answer:

t =  30 min

Step-by-step explanation:

d=13 km v=48 km/h a=5 km  d2 = a2 + x2  x=d2a2=13252=12 km  v = s/t  t1=v2 x=482 12=21=0.5 h  t=t1 min=t1 60  min=0.5 60  min=30 min=30 min

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