Two bikers John and Jane left from a church on their bikes at 12 pm. John headed towards north with an average speed of 20 km/hr, whereas Jane headed towards west with an average speed of 25 km/hr. How far will they be from each other at 1.30 pm? Calculate your answer correct to two decimal places.
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Answer:
Let the distance travelled by x km.
Then,
10
x
−
15
x
=2
⇒3x−2x=60
⇒x=60km.
Time taken to travel 60 km at 10 km/hr = (
10
60
)hrs = 6 hrs.
So, Robert started 6 hours before 2 P.M. i.e., at 8 A.M.
∴ Required speed =(
5
60
)kmph. = 12 kmph.
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