A submarine took 9 hours to complete a journey. For the first 5

hours, it travelled at an average speed of 106 km/h. For the rest

of the journey, it travelled at an average speed of 125 km/h.

What was the total distance of the journey?

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Answer:1030 km

Explanation:t= 9 hours

t1= 5 hours

s1= 106 km/h

d1 + d2= d

t1 + t2 =t

5 hours + t2 =9 hours

t2= 5 hours – 9 hours

t2= 4 hours

s2= 125km/h

d= ?

s= d/t

s1= d1/t1

106= d1/5

d1= 106 x 5

d1= 530km

s2= d2/t

125= d2/4

d2= 125 x 4

d2= 500km

d= d1 + d2

d= 530 + 500

d= 1030km