From Singapore, Karl drove at a constant speed of $80$ km/h for $1$ hour $45$ minutes unt

Question

From Singapore, Karl drove at a constant speed of $80$ km/h for $1$ hour $45$ minutes until he arrived at a rest-stop. He rested there for $x$ hours. Then, he drove at a constant speed of $110$ km/h for $2$ hours until he arrived at Kuala Lumpur.

Calculate the total distance travelled.
Given that his average speed for the whole journey was $90$ km/h, find the number of minutes he rested.

Accepted Answer

(a) $360\text{ km}$ (b) $15\text{ minutes}$

Word Problem: Speed, Distance and Average Speed

Word Problem: Speed, Distance and Average Speed

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