Q1. A plane left 30 minutes later than the scheduled time and in order to reach the destination 1500 km away in time it had to increase the speed by 250 km hr from the usual speed Its usual speed is

Q2. A boy rides his bicycle 10 km at an average speed of 12 km hr and again travels 12 km at an average speed of 10 km hr His average speed for the entire trip is approximately

Q3. A van complete a certain journey in 18 hour It cover half the distance at 30 km hr and the rest at 60 km hr The distance covered is

Q4. The cost of fuel running the engine of an army tank is proportional to the square of the speed and Rs 64 per hour for a speed of 16 kmph Other costs amount to Rs 400 per hour The tank has to make a journey of 400 km at a constant speed The total cost for the journey at this most economical speed is

Q5. Walking at 3 2 of his normal speed Sehwag takes 40 minutes less than the usual time What is the new time taken by Sehwag