Question
A,B and C run around a Circular track starting from the
same point simultaneously and in the same direction at the speed of 8 kmph, 12 kmph and 16 kmph respectively. If the length of the track is 800 metre, when will A, B and C meet at the starting point for the first time after they start the race?Solution
8km = 8000 m A makes it around the track 10 times (8000/800) in an hour Similarly B = 15 times and C = 20 times in an hour In 60 minutes, A will complete track once every 6 minutes, B once every 4 minutes and C once every 3 minutes LCM of A,B,C = LCM(6,4 & 3)= 12Â Alternative:Â Time = Distance/Speed Time for A = 0.8/8 hours Time for B = 0.8/12 hours Time for C = 0.8/16 hours LCM of A,B,C = (LCM of numerator)/(HCF of Denominator) = (LCM of 0.8,0.8,0.8)/(HCF of 8,12,16) = 0.8/4 hours 0.8/4 hours = 12 minutes
Inactive Nitrogen and Argon gases are usually used in electric bulbs in order to
Zero group was introduced by
Which part of the brain is responsible for balance and coordination?
Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium becauseÂ
Which of the following is/are correct?
1. Displacement current can exist in vacuum
2. Magnetic field can exist without electric f...
Lamberts law is related to –
The main thinking part of the brain is:
Study the given information.
Consider the force on a current carrying straight conductor in a magnetic field.
(i) It is perpendicular...
Marbles come under which category of rockes?
Which of the following part of the earth doesn’t allow the S wave to pass through itself?