Nidhi reached her institute in 3 hours while travelling by bus with a wheel radius of 70 cm and making 250 revolutions in one minute. One day, she left for the institute one hour later than usual…
Question and options
Nidhi reached her institute in 3 hours while travelling by bus with a wheel radius of 70 cm and making 250 revolutions in one minute. One day, she left for the institute one hour later than usual time. Then to reach her institute on time, she should increase her speed by ____. [Use ]
- 98 km/hr
- 33 km/hr
- 68.5 km/hr
- 40 km/hr
Answer and explanation
Correct answer: B - 33 km/hr
Wheel circumference = 2 x 22/7 x 0.7 = 4.4 m; 250 rpm -> 1100 m/min = 66 km/h. Distance = 198 km. To cover it in 2 h needs 99 km/h, an increase of 33 km/h.
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