A delivery boy started from his office at 10 a.m. to deliver an article. He rode his scooter at speed of 32 km/h. He delivered the article and waited for 15 minutes to get the payment. After the payment was made, he reached his office at 11.25 a.m., travelling at a speed of 24 km/h. Find the total distance travelled by the boy.

Answer: Option C

Solution

Answer: Option C

Solution:

15 min. rest
Total time = 1 hr 10 min
Distance same
Speed ⟶ 32 : 24
              4 : 3
Time ⟶ 3 : 4
7 unit ⟶ 70 min
1 unit ⟶ 10 min
Total distance = $$32\times \frac{1}{2}+\frac{24}{60}\times 40$$
= 16 + 16
= 32 km