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d

these r all factors of 30
1*30=30
2*15=30
3*10=30
5*6=30
like that

( d ) 6 days

R>P>Q>T
V>S>P
so the lightest is T.

127.179(app)
given distance of the train along the wind is 695
and againt the wind is 498
and time = distance/speed
as we know that time is equal in both the cases hence equate
695/s1=498/s2———–(1);
where s1=speed of the plane + speed of the wind
and s2=speed of the plane -speed of the wind
given that speed of the wind is 21k/h
s1=sp+21
s2=sp-21
substitu in eq 1
we get the answer as 27.17(app)

In 3 hours thinker candle becomes half
In the same time thinner candle becomes one fourth. Now the
required condition is satisfied. So 3 Hours

Summation of 301 – summation of 99
=41550
Summation of n=((n*n+1)/2)

500

Pi * radius * radius
3.14 * 5 * 5

1:2:3 or 1:2:4