Question 73

Shital covers a certain distance in 9 hours at the speed of 40 km/h. If she wants to cover the same distance in 6 hours, then by how much will she have to increase her speed (in km/h)?

Solution

Shital covers a certain distance in 9 hours at the speed of 40 km/h.

Distance covered by her = $$speed\times\ time\ taken$$

= $$40\times9$$

= 360 km

If she wants to cover the same distance in 6 hours.

New speed = $$\frac{distance\ covered}{time\ taken}$$

= $$\frac{360}{6}$$

= 60 km/h

increase in her speed = 60-40

= 20 km/h

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