Ravi drove for 4 hours at a speed of 70 miles per hour and for 2 hours at 40 miles per hour. What was his average speed (in miles per hour) for the whole journey?

The mean of five numbers is 18. If one number is excluded, their mean is 16. The excluded number is:

A pen passing through two hands is finally sold at a profit of 44% of the original cost price. If the first dealer makes a profit of 20%, then the profit made by the second dealer is:

One number x is thrice the other number y. If the sum of both the numbers is 20, then what is the values of x and y are respectively ?

After seeing a policeman from a distance of 500 m, a thief starts running at a speed of 10 km/h. After noticing, the policeman chases immediately with a speed of 12 km h, and the thief is caught. The distance run by the policeman is:

A shopkeeper purchases 20000 units of a product at ₹1 each, 15000 units at ₹1.15 each and 5000 units at ₹2 each. What is the weighted average price of one unit? Correct to two decimal places)

A varies jointly with B and C. A = 6 when B = 3 and C = 2. Find A when B = 5 and C = 7.

In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

Everything (1) _________ us makes our environment. Living and non-living things form the (2) _________ of our surroundings. Plants, animals and microbes are parts of our environment. Humans have affected the environment in multiple (3) ______ like clearing of forests, building houses and farms, making roads, etc. This is the root (4) _______ of air, water and land pollution on the planet. Ecologists across the globe are making efforts to educate mankind about the (5) _________ of nature, the crisis we face and the methods of managing these crises.

Select the most appropriate option to fill in blank number 5.