Rahul runs for 20 mins at the speed of 20 km/hr after which he gets tired. He still manages to run for 10 mins but at a lesser speed of 10 km/hr. How much distance did Rahul cover? [2 MARKS]

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Solution

Calculation: 1 Mark
Result: 1 Mark

Distance covered in first 20 mins or one-third of an hour = one-third of 20 km (Since speed is 20 km/hr).
Distance covered in last 10 mins or one-sixth of an hour = one-sixth of 10 km (Since speed is 10 km/hr).

$T o t a l d i s t a n c e c o v e r e d = \frac{20}{3} + \frac{10}{6}$
$T o t a l d i s t a n c e c o v e r e d = \frac{50}{6} k m s$ =8.33 km

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