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Pankaj Kumar

· started a discussion

· 1 Months ago

explain (Question: 285145.0 )

any one helps me

Question:

In a race of one kilometer, P gives Q a start of 100 metres and still wins by 20 seconds. But if P gives Q a start of 25 seconds, Q wins by 50 metres. The time taken by P to run one kilometer is –

Options:
A)

17 seconds

B)

17.17 seconds

C)

17.24 seconds

D)

18.36 seconds

Solution:

Ans: (c)

  

Ipshit Tarun

· commented

· 1 Months ago

poocha hai- time taken by P to run 1 km-- Maan lo x time P ko lagta ek km me aur y time Q ko lagta 1 km me.Bas... ab time me equation bana lo....
Pehle case me---
Q 900 metre hi bhagega-- to time lega-- (900/1000) of y;
Dusre case me statement thoda ghuma ke de dia hai--

25 second ka start mila Q ko aur Q jeet gaya 50 metre se.. matlab jab race khata hua hoga to Q 1000 metre bhaga hoga aur P tab tak sirf 900 metre hi.-- Ye kaam simultaneous hoga-- to samay ka difference dono ke bhagne me sirf 25 secon hi to hoga..jo ki start me hi de diya gaya tha...Ab bana lo equation
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