Due to some technical problems, an aeroplane started late by one hour from its starting point.The pilot decided to increase the speed of the aeroplane by 100km/hr from its usual speed , to cover a journey of 1200km in time .Find the usual speed of the aeroplane.
The train was moving with uniform speed after covering a distance of 30km some defect develop with the engine of the train and for this reason its speed reduced to 4 by 5 of its original speed. The train reaches is destination late by 45 minutes in case the defects had happened after covering 18 km more the train would have reached just 36 minute late find the speed of the train at the start and the distance of Germany