Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What does below Rebus mean ?

esgg sgeg gegs gsge

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

Buy me, smell me or deliver me, I do not change.

Who am I?

What is the fastest way to double your money?

John was gifted a new Hayabusa. He drove x miles at 55mph. Then he drove x+20 miles at 40mps. He drove his bike for 100 minutes. How much distance did he travel?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?