Oscar took 4 hours to travel from Country F to Country G at 62 km/h. Then he travelled from Country G to another country at 1.5 times his original speed. 25% of the distance from Country F to Country G is equal to ¹₃ of the distance from Country G to the next country. Find the average speed for the whole journey and express it as a mixed number.
Distance he travelled from Country F to Country G
= 4 x 62
= 248 km

Speed from Country G to another country
= 1.5 x 62
= 93 km/h

25% = ²⁵₁₀₀ = ¹₄

¹₄ Distance from Country F to Country G = ¹₃ Distance from Country G to next country
¹₄ Distance from Country F to Country G = ¹₃ Distance from Country G to next country

4 u = 248
1 u = 248 ÷ 4 = 62

Distance from Country G to the next country
= 3 u
= 3 x 62
= 186 km

Time taken from Country G to the next country
= 186 ÷ 93
= 2 h

Total distance of the whole journey
= 248 + 186
= 434 km

Total time taken for the whole journey = 4 + 2 = 6 h

Average speed of the whole journey
= 434 ÷ 6
= 72 ²₆
= 72 ¹₃ km/h

Answer(s): 72 ¹₃ km/h