Races and Games Practice Test 1 with solutions

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Question : 22 of 40

Marks: +1, -0

In a 100 metre race, A runs at 5 km/h. A gives B a start of 8 metres and still beats him by 6 seconds. Find the speed of B.

4.9 km/hr
6.5 km/hr
5.8 km/hr
5 km/hr
5.2 km/hr

Solution:

Speed of B =

{18}/5[{(1000-y)x}/{3600+xt}]

km/hr
y = 8, x = 5, t = 6
=

{18}/5[{(1000-8)5}/{3600+(5×6)}]

km/hr
=

{18}/5× [{992×5}/{3630}]

km/hr
=

{89280}/{18150}

km/hr
= 4.9 km/hr

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