Races and Games Practice Test 1 with solutions

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Question : 12 of 40

Marks: +1, -0

In a 100 metre race, A runs at 6 km/h. A gives B a start of 7 metres and still beats him by 8 seconds. Find the speed of B.

7 km/hr
6.5 km/hr
5.8 km/hr
2.5 km/hr
None of these

Solution:

Speed of B =

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

km/hr
y = 7, x = 6, t = 8
=

{18}/5[{(1000-7)6}/{3600+(6×8)}]

km/hr
=

{18}/5×[{993×6}/{3600+48}]

km/hr
=

{18}/5×{993×6}/{3648}

km/hr
=

{107244}/{18240}

km/hr = 5.8 km/hr

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