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Let the length and speed of train be ‘l’ metres and ‘x’ m/s, respectively.
Then, according to question,
(l + 300)/20 = (l + 600)/35
7l + 2100 = 4l + 2400
3l = 300
l = 100 metres
x = (l + 300)/20 = 400/20 = 20 m/s = 20×(18/5) = 72 km/h
Find the cube of 373.
Length of a minute hand of a clock is 14 cms. Area swept bv the minute hand in 5 minutes is:
How many times are the hour and the minute hands of a clock at a right angle in a period of two days?
A clock gets fast by 15 minutes every day. If, on a certain day, the clock shows correct time at 12 in the noon, what time will the clock show at 4:00 ...