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11 votes
11 votes
Hamidah travels 90 miles at an average speed of 50 mph.

She then travels a further 60 miles.
The average speed for the entire journey is 54 mph.
Assuming Hamidah didn't stop, what was her average speed for the final 60 miles to 2 dp?

User Kith
by
3.1k points

1 Answer

17 votes
17 votes

Answer: 61.36mph

Explanation:

let the speed be x


(90)/(50) + (60)/(x ) = (90 + 60)/(54)


1.8 + (60)/(x) = (25)/(9)

60/x=44/45

X = 61.36 (mph)

So her average speed for the 60 miles is 61.36 mph.

hope it helps #itzadmirer

User Kishore Indraganti
by
3.0k points