Question

A car runs 3 hours at a speed of 75 kilometres per hour and next 2 hours at
the speed of 95 kilometres per hour. Find the average speed of the car for
the 5 hours jaurney.
(A) 87 km/h (B) 85 km/h (C) 83 km/h (D) 89 km/h
(E) None of these​

Answer 1

Answer:

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Answer 2

Answer:

(C)83 km/h

Step-by-step explanation:

i calculated indirectly , (but I tell you the method isn't wrong)

so ,now

1) for first half

distance covered in 1 hour = 75 km

distance covered in 3 hours = 75×3

=225 km

2) for second half

distance covered in 1 hour = 95 km

distance covered in 2 hour =95×2

=190 km

now, total distance covered = 415 km

total time taken = 5 hours (2+3hrs)

average speed=

$\frac{total \: distance \: covered}{total \: time \: taken}$

$\frac{415}{5}$

= 83 km is average speed .

hope helps.