A car travels at a speed of 50 km/hr for 30 minutes, at 30 km/hr for next 15 minutes and then 70 km/hr for next 45 minutes. What is the average speed of the car?

A car movies at a constant speed of 60 km hr^-1 for half of the journey and 80 km hr^-1 for remaining half of the journey. Find the average speed of the car in one hour.

If John drives a car at a speed of 60 kms/hour he has to spend Rs. 5 per km on petrol. If he drives at a faster speed of 90 kms/hour, the cost of petrol increases to 8 per km. He has Rs. 600 to spend on petrol and wishes to travel the maximum distance within an hour. Formulate the above problem as L.P.P.

If John drives a car at a speed of 60 kms/ hour he has to spend Rs. 5 per km on petrol. If he drives at a faster speed of 90 km/hour, the cost of petrol increases to Rs. 8 per km. He has Rs. 600 to spend on petrol and wishes to travel the maximum distance within an hour. Formulate the above problem as LPP.

Solve the following questions. (ii) A train travels 360 km with uniform speed. The speed of the train is increased by 5 km//hr , it takes 48 minutes less to cover the same distance. Find the initial speed of the train.

If a car travelling at 58 km/h overtakes another car travelling at 40 km/h, the relative velocity of first car with respect to another car is

A bus travel its onward journey with a constant speed of 30km//hr and its return journey with a constant speed of 60km//hr .the average speed for its entire journey is A. 90 k m / h r B. 45 k m / h r C. 40 k m / h r D. 15 k m / h r

A car moves at speed of 36 km hr^-1 on a level road. The coefficient of friction between the tyres and the road is 0.8 . The car negotiates a curve of radius R. IF g=10 ms^-2 , then the car will skid (or slip) while negotiating the curve if the value R is

Solve the following : A car travelling at 72 km/h covers al certain distance in 6 hours. What should be the decrease in speed, if the same distance is to be covered ini 8 hours ? What time will it take to cover the same distance at the speed of 90 km/h?

A train A is travelling at a speed of 108 km hr^(-1) . The train approaches another train B standing on the platform. The engine of the train B blows its hom. The frequency of the horn as observed by the driver in train A is 504 Hz. The frequency of the hom of train B is (speed of sound = 330 ms^(-1) )