Question

Alvaro takes 1 hour to cover a distance of 3 km while riding a bicycle. If he rides at the same speed, in how many hours will he cover a distance of 21 km?

• A. 6 hours
• B. 5 hours
• C. 7 hours
• D. 8 hours

Answer 1

The correct option is C 7 hours

Alvaro takes 1 hour to cover 3 km.

So, if he rides the bicycle at the same speed and covers 21 km, which is 7 times the previous distance (21 = 3 × 7), he will take 7 times the previous time.

In other words, the time taken by Alvaro to cover 21 kms is given by
$\frac{21}{3}\text{hours}=7\text{hours}.$