Question

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.

Answer 1

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.