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A bike covers 150 m in 10 seconds. What is its speed in km/h?

Rahul alternates between walking and cycling. He walks 1 km in 10 minutes and cycles 1 km in 5 minutes. If he cycles half of a 12 km trip and walks the other half, how long will the trip take?

Which of the following numbers is the smallest?

If \( \frac{0.707}{49.0} = a \), then the value of \( \frac{7.07}{0.49} \) is:

If \( a \) is added to each of 4, 7, 10 and 16, the numbers so obtained are in proportion. What is the mean proportional between \( (a - 1) \) and \( (5a + 6) \)?

A person's average daily expense over \( 5 \) days is \( ₹200 \).

If the total expense for the first \( 4 \) days is \( ₹700 \), what was the expense on the \( 5^{th} \) day?

If the radius of a circle is doubled, its area becomes:

The area of a circle is \( 616 \text{ cm}^2 \).

Find its radius.

(\( \pi=22/7 \))

An article is marked at \( ₹200 \) and sold after successive discounts of \( 20% \) and \( 20% \). What is the final selling price?

The radius of a circle is increased by \( 20% \).

Find the percentage increase in area.