<PRE><B>Question 697453</B>
kiran sets off on a walk at a speed
of 6km/h. 10 minutes later, 
----
distance = rate*time = 6 km/hr*(1/6)hr = 1 km
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her brother Ali sets after her on his bicycle
at 15km/h. How far must Ali go to
catch up with Kiran?
--
Kiran DATA:
rate = 6 km/hr ; time = t hrs ; distance = 6t km
----
Ali DATA:
rate = 15 km/hr ; time = t hrs ; distance = 15t km
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Equation:
distance = distance
15t = 6t + 1
9t = 1
t = 1/9 hr. 
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Ali distance = 15t = 15(1/9) = 1 2/3 km or 5/3 km
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Cheers,
Stan H.
</PRE>