Quantitative Aptitude - Arithmetic Ability Questions

A student multiplied a number by 6/7 instead of 7/6. What is the percentage error in the calculation?

The flight fare between two cities is increased in the ratio 11:13. What is the increase (in Rs) in the fare, if the original fare was Rs 12100?

What should be the average speed of a car to cover a distance of 189 km in 3.5 hours?

What is the value of (2/√3 +tan45° ) ?

A car moving in the morning fog passes a man walking at 4km/h. in the same direction. The man can see the car for 3 minutes and visibility is upto a distance of 130m. The speed of the car is :

Raghunandan sells a machine for Rs 45 lakhs at a loss. Had he sold it for Rs 55 lakh, his gain would have been 9 times the former loss. Find the cost price of the machine.

Selling price of an article is Rs 27692 and loss percentage is 14%. If the selling price is Rs 37352, then what will be the profit percentage?

If x2+ x = 19, then what is the value of (x + 5)2+ [1/(x + 5)2]?