General Test - ...

A train passes two persons moving at the speeds 26 m/s and 42 m/s in the opposite direction to that of the train in 9 sec and 7 sec respectively. The length of the train is:

Two trains running in opposite directions cross a man standing on the platform in 25 seconds and 32 seconds respectively and they cross each other in 30 seconds. The ratio of their speed is:

A train running at the speed of \(60\) km/hr crosses a pole in \(9\) sec. What is the length of the train?

Find the roots of equation \(a y^{2}+3 b y+c=0\), if \(3 \mathrm{~b}=\mathrm{a}+\mathrm{c}\).

Find a fraction with denominator \(30\) which is equivalent to \(\frac{5}{6}\).

In a school of $750$ boys, the average age of the boys is $15.4$ years. The average age remains $15.3$ years if $50$ boys left the school. Find the average age of the students who left the school-

Looking at the number line, state which of the following statements is not true?

In what ratio must 2 varieties of coffee costing Rs. 330 and Rs. 440 per kg be mixed to get a mixture worth Rs. 363 per kg?

Probability of getting three heads in tossing four coins is:

A vertical rod \(20\) m long casts a shadow \(10\) m long on the ground. At the same time a tower casts a shadow \(50\) m long on the same ground. The height of the tower is: