Question
Traveling 500 km, a driver covers the first 40% at 70
kmph, the next quarter at 60 kmph, and the remaining distance at 50 kmph. What is the average speed?Solution
ATQ, Time for the first segment at 70 kmph = (500 × 0.40) / 70 = 2.86 hours Time for the second segment at 60 kmph = (500 × 0.25) / 60 = 2.08 hours Distance for the third segment = 500 - (500 × 0.40) - (500 × 0.25) = 500 - 200 - 125 = 175 km Time for the third segment at 50 kmph = 175 / 50 = 3.5 hours Average speed = 500 / (2.86 + 2.08 + 3.5) ≈ 58.14 kmph
What is the life span of RBC?
The Doppler Effect occurs in:
In Young’s double-slit experiment, dark fringes on the screen occur where:
Which one among the following statements is not true for Mammals?
Non-vascular plants do not contain:
According to a recent study, Groundwater in India is contaminated by which element?
What is the boiling point of pure water at normal atmospheric pressure (sea level)?
Up to what temperature can a mercury thermometer measure?
A car travels 150 kilometers in 3 hours. What is its average speed?
A piece of wood is held under water. The up thrust on it will be:
Relevant for Exams:
