Tribeni bad to travel 175 km in 3.5 hours. However, she travelled at the rate of 58 km/hr for 2.5 hoursand then rested for 20 minutes before completing the journey. If Tribeni managed to reach on time, herspeed during the last stretch would have been .........
A) 36 km/hr B) 30 km/hr C) 42.5 km/hr D) 45 km/hr
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Answer:
45 km/hr
Step-by-step explanation:
total distance = 175 km
total time = 3.5 hours
for 2.5 hours speed = 58 km/hr
for 2.5 hours distance covered = speed × time = 58 × 2.5 = 145 km
distance left = 175-145 =30km
rested for = 20 minutes = 20/60 hours = 1/3 hours
time left = 3.5 - (2.5+1/3) = 3.5 - 8.5/3 = 2/3 hours
so speed during last ride = distance/time = 30/(2/3) = 30×3/2 = 45 km/hr
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