Question

Distance between Bholu’s and Golu’s house is 9 km. Bholu has to attend Golu’s birthday party at 7 o’clock. He started from his home at 6 o’clock on his bicycle and covered a distance of 6 km in 40 minutes. At that point, he met Chintu and he spoke to him for 5 minutes and reached Golu’s birthday party at 7 o’clock. With what speed did he cover the second part of the journey? Calculate his average speed for the entire journey.

Answer 1

Distance between Bholu’s and Golu’s house = 9 km

Distance covered by Bholu in first part of the journey = 6 km

Time taken to cover 6 km = 40 min

Distance covered by Bholu in second part of the journey = 9 − 6 = 3 km

Time taken to cover 3 km = 60 – (40 + 5) = 15 min

Speed of Bholu while covering second part of the journey

= `(3  "km")/((15/60)"h")`

= 12 km/h

Average speed of Bholu for the entire journey

= `("Total distance")/("Time taken")`

= `(9  "km")/(60  "min")`

= 9 km/h