At 5 in the morning, 3 cocks crowed together. The first cock crows after every 36 secs, the second cock, after every 30 secs and the thired cock crows after every 48 secs. When will the cocks crow together again?

A particle moves in a straight line and its velocity v at time t seconds is given by v=(6t^(2)-2t+3) cm/sec. Find the distance travelled by the particle during the first 5 second after the start.

When sound is produced in an Aeroplane moving with a velocity of 200 m/sec horizontally its echo is heard after 10sqrt(5) seconds. If velocity of sound in air is 300 m/sec the elevation of the aircraft is

For a fist order reaction specific reaction rate is 6.3xx10^(-4) sec^(-1) . If the initial concentration be 0.5 mole/lit then find the rate after 30 minute. For a second order reaction with initial concentration of reactant be 0.125 (M) and specific reaction rate 4.2xx10^(-3) mol^(-1) lit sec^(-1) . Then find half life of the reaction.