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bharat

· started a discussion

· 1 Months ago

how 486 seconds equal 8min and 6sec..... it should be 8 min and 1sec (Question: 186067.0 )

.

Question:
A motorist travels along the boundary of a square field of area 1476225 m2, at 36 km/hr. He returns to starting point in–
Options:
A) 8 min 8 sec
B) 6 min 8 sec
C) 8 min 6 sec
D) 6 min 6 sec
Solution:
Ans: (c) Perimeter of the square field = \(\sqrt{1476225}\)   m

= 4 × 1215 m = 4860 m

speed of the man = 36 km/h 

=  36 × \(\cfrac{5}{18}\)

= 10 m/s 

Time taken by motorist =  \(\cfrac{4860}{10}\)   seconds

= 486 seconds

= 8 min. 6 sec.

Nitin Tripathi

· commented

· 1 Months ago

Yet to be approved!

Subhash Gangwar

· commented

· 1 Months ago

Yet to be approved!

DIVYA CHAUDHARY

· commented

· 1 Months ago

yes it should be 8 min 1 sec

Umakant

· commented

· 1 Months ago

Yet to be approved!

MAHIMA S

· commented

· 1 Months ago

486 sec = 486/60 = 8.1 min...since 1 min =60 sec ,0.1 min=6 sec..hence the answer becomes 8 min and 6 sec.
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