RRB Group D 17-Sep-2018 Shift 2 Solved Paper

Question : 100 of 100

Marks: +1, -0

Walking at a speed of 10 km/hr, Madhu reaches her university 15 minutes late, next time, she increases her speed by 2 km/hr, but she is still late by 5 minutes. The distance of the university from her house is :

15 km
30 km
20 km
10 km

Validate

Solution:

∵ 10 \text "Km/hr"-15 {\min} \;\text " late "\;

2 \text "Km/hr"-5 {\min} \;\text " late "\;

∴ \;\text " Distance "\;=[(x_{1}-y_{1})(x+y) \;{x}/{y}] {km}

=[(\;{15}/{60}-\;{5}/{60})(10+2)(\;{10}/{2})] {km}

=\;{10}/{60} × 12 × 5=10 {km}

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