71.

A boat is moving away from an observation tower. It makes an angle of depression of 60° with an observer's eye when at a distance of 50 m from the tower. After 8 sec, the angle of depression becomes 30°. By assuming that it is running in still water, the approximate speed of the boat is

• 33 km/hr

• 42 km/hr

• 45 km/hr

• 50 km/hr

The bar graph given indicates the income of a firm. Study the graph and answer the questions:

Which period shows a steady increase of income?

• March to May

• February to April

• February to May

• Insufficient data to predict

The bar graph given indicates the income of a firm. Study the graph and answer the questions:

During which month, the ratio of the income to that of the previous month is the largest?

• February

• March

• April

• May

The bar graph given indicates the income of a firm. Study the graph and answer the questions:

The income in May is how many times to that of February?

• 3.25

• 4

• 3.5

• 5

The bar graph given indicates the income of a firm. Study the graph and answer the questions:

The average monthly income of the firm (in â‚¹ lakh) is:

• 7.6

• 6

• 8.8

• None of these