Flynn took 6 hours to travel from Country P to Country Q at 74 km/h. Then he travelled from Country Q to another country at 1.5 times his original speed. 25% of the distance from Country P to Country Q is equal to ¹₄ of the distance from Country Q to the next country. Find the average speed for the whole journey and express it as a mixed number.
Distance he travelled from Country P to Country Q
= 6 x 74
= 444 km

Speed from Country Q to another country
= 1.5 x 74
= 111 km/h

25% = ²⁵₁₀₀ = ¹₆

¹₄ Distance from Country P to Country Q = ¹₄ Distance from Country Q to next country
¹₄ Distance from Country P to Country Q = ¹₄ Distance from Country Q to next country

4 u = 444
1 u = 444 ÷ 4 = 111

Distance from Country Q to the next country
= 4 u
= 4 x 111
= 444 km

Time taken from Country Q to the next country
= 444 ÷ 111
= 4 h

Total distance of the whole journey
= 444 + 444
= 888 km

Total time taken for the whole journey = 6 + 4 = 10 h

Average speed of the whole journey
= 888 ÷ 10
= 88 ⁸₁₀
= 88 ⁴₅ km/h

Answer(s): 88 ⁴₅ km/h