Time and Distance Practice Test 4 with solutions

Question : 20 of 38

Marks: +1, -0

Pratap went to his office by car at a speed of 72 km/hr but while coming, he faces traffic jam. Hence his average speed is reduced to 34 km/hr. Find the distance between his residence and office if he spent

2 7/{14}

hours in travelling from home to office and office to home.

69 km
63 km
72 km
79 km
113 km

Validate

Solution:

Let the distance from home to office = d km

d/{72}+d/{34}

2 {17}/{24}

d(1/{72}+1/{34})

{65}/{24}

d({17+36}/{1224})

{65}/{24}

d =

{65}/{24} × {1224}/{53}

= 63 km

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