Question

Ravi drives at a speed of 20 km per hour. If he triples his speed, how many kilometres can he cover in 5 hours?

• A. 100 km
• B. 150 km
• C. 300 km
• D. 350 km

Answer 1

The correct option is C 300 km

The speed at which Ravi drives is 20 km per hour.
When he triples his speed, his new speed becomes $3\times 20\text{km per hour}=60\text{km per hour}.$

That is, Ravi will now be able to cover a distance of 60 kilometres in 1 hour.
Thus, he will be able to cover $5\times 60\text{km}=300\text{km}$ in 5 hours.