How many triangles are there in the given figure?

In the following question, select the number which can be placed at the sign of ? from the given alternatives.

A certain sum of money triples itself in 5 years at simple interest. In how many years it will be five times?

A train travels 40% faster than a car. Both start from point A at the same time and reach point B, 140 km away at the same time. On the way the train takes 25 minutes for stopping at the stations. What is the speed (in km/hr) of the train?

After deducting 60% from a certain number and then deducting 15% from the remainder, 1428 is left. What was the initial number?

If the price of pen decreases by 20%, then a man can buy 10 more pens for Rs 100. What is the new price (in Rs) of each pen?

The average of 5 members of a family is 24 years. If the youngest member is 8 years old, then what was the average age (in years) of the family at the time of the birth of the youngest member?

Rs 3200 is divided among A, B and C in the ratio of 3 : 5 : 8 respectively. What is the difference (in Rs) between the share of B and C?