Question

A boy runs 20 km in 2.5 hours. How long will he take to run 32 km at double the previous speed ?

• A. 2.5 hours
• B. 5 hours
• C. 2 hours
• D. 4 hours

Answer 1

Answer:

C. 2 hours

Speed = distance/time speed of boy = 20 kms/(2.5 hrs) ⇒ 8 km/hr If the speed is doubled the new speed will be = 8 × 2 = 16 km/hr Then the time taken by the boy to run 32 kms Time = Distance/speed time = 32/16 ⇒ 2 hours